diff --git a/.travis.yml b/.travis.yml
index 8689556a..5a631ab7 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -38,7 +38,7 @@ script:
 
 after_success:
   - docker image ls
-  - ${TRAVIS_BUILD_DIR}/scripts/docker-push.sh
+  - make release
 
 after_failure:
   - cd ${TRAVIS_BUILD_DIR}/${VERSION} && make logs
diff --git a/7.1/Makefile b/7.1/Makefile
index 4dccddaa..72d0ee68 100644
--- a/7.1/Makefile
+++ b/7.1/Makefile
@@ -2,30 +2,33 @@
 -include env_make
 
 VERSION ?= 7.1
+TAG_APPENDIX ?= -php$(VERSION)
+BUILD_TAG = build-$(TAG_APPENDIX)
 REPO = docksal/cli
-TAG = build-$(VERSION)
 NAME = docksal-cli-$(VERSION)
 CWD = $(shell pwd)
 
 # Improve write performance for /home/docker by turning it into a volume
 VOLUMES += -v /home/docker
 
+.EXPORT_ALL_VARIABLES:
+
 .PHONY: build test push shell run start stop logs clean release
 
 build:
-	docker build --cache-from=$(REPO):edge-php$(VERSION) -t $(REPO):$(TAG) .
+	docker build --cache-from=$(REPO):edge$(TAG_APPENDIX) -t $(REPO):$(BUILD_TAG) .
 
 test:
-	IMAGE=$(REPO):$(TAG) NAME=$(NAME) VERSION=$(VERSION) ../tests/test.bats
+	IMAGE=$(REPO):$(BUILD_TAG) NAME=$(NAME) VERSION=$(VERSION) ../tests/test.bats
 
 push:
-	docker push $(REPO):$(TAG)
+	docker push $(REPO):$(BUILD_TAG)
 
 run: clean
-	docker run --rm --name $(NAME) -it $(PORTS) $(VOLUMES) $(ENV) $(REPO):$(TAG)
+	docker run --rm --name $(NAME) -it $(PORTS) $(VOLUMES) $(ENV) $(REPO):$(BUILD_TAG)
 
 start: clean
-	docker run -d --name $(NAME) $(PORTS) $(VOLUMES) $(ENV) $(REPO):$(TAG)
+	docker run -d --name $(NAME) $(PORTS) $(VOLUMES) $(ENV) $(REPO):$(BUILD_TAG)
 
 # Non-interactive and non-tty docker exec (uses LF instead of CRLF line endings)
 exec:
@@ -50,7 +53,7 @@ logs-follow:
 clean:
 	docker rm -vf $(NAME) >/dev/null 2>&1 || true
 
-release: build
-	make push -e TAG=$(TAG)
+release:
+	@../scripts/docker-push.sh
 
 default: build
diff --git a/7.1/config/php/zz-php.ini b/7.1/config/php/zz-php.ini
index 2ef39cd7..c653442d 100644
--- a/7.1/config/php/zz-php.ini
+++ b/7.1/config/php/zz-php.ini
@@ -1,7 +1,7 @@
 ; PHP global (CLI and FPM) settings
 ; To override settings for FPM use zz-php-fpm.conf
 [php]
-memory_limit = 1024M
+memory_limit = -1
 max_execution_time = 600
 date.timezone = UTC
 display_errors = On
diff --git a/7.2/Makefile b/7.2/Makefile
index 44cf6856..e127bccc 100644
--- a/7.2/Makefile
+++ b/7.2/Makefile
@@ -2,30 +2,33 @@
 -include env_make
 
 VERSION ?= 7.2
+TAG_APPENDIX ?= -php$(VERSION)
+BUILD_TAG = build-$(TAG_APPENDIX)
 REPO = docksal/cli
-TAG = build-$(VERSION)
 NAME = docksal-cli-$(VERSION)
 CWD = $(shell pwd)
 
 # Improve write performance for /home/docker by turning it into a volume
 VOLUMES += -v /home/docker
 
+.EXPORT_ALL_VARIABLES:
+
 .PHONY: build test push shell run start stop logs clean release
 
 build:
-	docker build --cache-from=$(REPO):edge-php$(VERSION) -t $(REPO):$(TAG) .
+	docker build --cache-from=$(REPO):edge$(TAG_APPENDIX) -t $(REPO):$(BUILD_TAG) .
 
 test:
-	IMAGE=$(REPO):$(TAG) NAME=$(NAME) VERSION=$(VERSION) ../tests/test.bats
+	IMAGE=$(REPO):$(BUILD_TAG) NAME=$(NAME) VERSION=$(VERSION) ../tests/test.bats
 
 push:
-	docker push $(REPO):$(TAG)
+	docker push $(REPO):$(BUILD_TAG)
 
 run: clean
-	docker run --rm --name $(NAME) -it $(PORTS) $(VOLUMES) $(ENV) $(REPO):$(TAG)
+	docker run --rm --name $(NAME) -it $(PORTS) $(VOLUMES) $(ENV) $(REPO):$(BUILD_TAG)
 
 start: clean
-	docker run -d --name $(NAME) $(PORTS) $(VOLUMES) $(ENV) $(REPO):$(TAG)
+	docker run -d --name $(NAME) $(PORTS) $(VOLUMES) $(ENV) $(REPO):$(BUILD_TAG)
 
 # Non-interactive and non-tty docker exec (uses LF instead of CRLF line endings)
 exec:
@@ -50,7 +53,7 @@ logs-follow:
 clean:
 	docker rm -vf $(NAME) >/dev/null 2>&1 || true
 
-release: build
-	make push -e TAG=$(TAG)
+release:
+	@../scripts/docker-push.sh
 
 default: build
diff --git a/7.2/config/php/zz-php.ini b/7.2/config/php/zz-php.ini
index 2ef39cd7..c653442d 100644
--- a/7.2/config/php/zz-php.ini
+++ b/7.2/config/php/zz-php.ini
@@ -1,7 +1,7 @@
 ; PHP global (CLI and FPM) settings
 ; To override settings for FPM use zz-php-fpm.conf
 [php]
-memory_limit = 1024M
+memory_limit = -1
 max_execution_time = 600
 date.timezone = UTC
 display_errors = On
diff --git a/7.3/Makefile b/7.3/Makefile
index 913fb83b..0d425226 100644
--- a/7.3/Makefile
+++ b/7.3/Makefile
@@ -2,30 +2,33 @@
 -include env_make
 
 VERSION ?= 7.3
+TAG_APPENDIX ?= -php$(VERSION)
+BUILD_TAG = build-$(TAG_APPENDIX)
 REPO = docksal/cli
-TAG = build-$(VERSION)
 NAME = docksal-cli-$(VERSION)
 CWD = $(shell pwd)
 
 # Improve write performance for /home/docker by turning it into a volume
 VOLUMES += -v /home/docker
 
+.EXPORT_ALL_VARIABLES:
+
 .PHONY: build test push shell run start stop logs clean release
 
 build:
-	docker build --cache-from=$(REPO):edge-php$(VERSION) -t $(REPO):$(TAG) .
+	docker build --cache-from=$(REPO):edge$(TAG_APPENDIX) -t $(REPO):$(BUILD_TAG) .
 
 test:
-	IMAGE=$(REPO):$(TAG) NAME=$(NAME) VERSION=$(VERSION) ../tests/test.bats
+	IMAGE=$(REPO):$(BUILD_TAG) NAME=$(NAME) VERSION=$(VERSION) ../tests/test.bats
 
 push:
-	docker push $(REPO):$(TAG)
+	docker push $(REPO):$(BUILD_TAG)
 
 run: clean
-	docker run --rm --name $(NAME) -it $(PORTS) $(VOLUMES) $(ENV) $(REPO):$(TAG)
+	docker run --rm --name $(NAME) -it $(PORTS) $(VOLUMES) $(ENV) $(REPO):$(BUILD_TAG)
 
 start: clean
-	docker run -d --name $(NAME) $(PORTS) $(VOLUMES) $(ENV) $(REPO):$(TAG)
+	docker run -d --name $(NAME) $(PORTS) $(VOLUMES) $(ENV) $(REPO):$(BUILD_TAG)
 
 # Non-interactive and non-tty docker exec (uses LF instead of CRLF line endings)
 exec:
@@ -50,7 +53,7 @@ logs-follow:
 clean:
 	docker rm -vf $(NAME) >/dev/null 2>&1 || true
 
-release: build
-	make push -e TAG=$(TAG)
+release:
+	@../scripts/docker-push.sh
 
 default: build
diff --git a/7.3/config/php/zz-php.ini b/7.3/config/php/zz-php.ini
index 2ef39cd7..c653442d 100644
--- a/7.3/config/php/zz-php.ini
+++ b/7.3/config/php/zz-php.ini
@@ -1,7 +1,7 @@
 ; PHP global (CLI and FPM) settings
 ; To override settings for FPM use zz-php-fpm.conf
 [php]
-memory_limit = 1024M
+memory_limit = -1
 max_execution_time = 600
 date.timezone = UTC
 display_errors = On
diff --git a/scripts/docker-push.sh b/scripts/docker-push.sh
index c8724c9d..de955b29 100755
--- a/scripts/docker-push.sh
+++ b/scripts/docker-push.sh
@@ -40,27 +40,21 @@ tag_and_push ()
 	echo "Pushing ${target} image ..."
 	docker tag ${source} ${target}
 	docker push ${target}
-
-	# Cloud9 flavor
-	echo "Pushing ${target}-ide image ..."
-	docker tag ${source}-ide ${target}-ide
-	docker push ${target}-ide
 }
 
 # ---------------------------- #
 
-# Possible docker image tags
-IMAGE_TAG_EDGE="edge-php${VERSION}"
-IMAGE_TAG_STABLE="php${VERSION}"
-
-# Read the split parts
+# Extract version parts from release tag
 IFS='.' read -a ver_arr <<< "$TRAVIS_TAG"
+VERSION_MAJOR=${ver_arr[0]#v*}  # 2.7.0 => "2"
+VERSION_MINOR=${ver_arr[1]}  # "2.7.0" => "7"
 
-# Major version, e.g. 2-php7.2
-IMAGE_TAG_RELEASE_MAJOR="${ver_arr[0]#v*}-php${VERSION}"
-
-# Major-minor version, e.g. 2.5-php7.2
-IMAGE_TAG_RELEASE_MAJOR_MINOR="${ver_arr[0]#v*}.${ver_arr[1]}-php${VERSION}"
+# Possible docker image tags
+# "image:tag" pattern: <image-repo>:<software-version>[-<image-stability-tag>][-<flavor>]
+IMAGE_TAG_EDGE="edge${TAG_APPENDIX}"  # e.g., edge[APPENDIX]
+IMAGE_TAG_STABLE="stable${TAG_APPENDIX}"  # e.g., stable[APPENDIX]
+IMAGE_TAG_RELEASE_MAJOR="${VERSION_MAJOR}${TAG_APPENDIX}"  # e.g., 2[APPENDIX]
+IMAGE_TAG_RELEASE_MAJOR_MINOR="${VERSION_MAJOR}.${VERSION_MINOR}${TAG_APPENDIX}"  # e.g., 2.7[APPENDIX]
 IMAGE_TAG_LATEST="latest"
 
 # Skip pull request builds
@@ -70,14 +64,14 @@ docker login -u "${DOCKER_USER}" -p "${DOCKER_PASS}"
 
 # Push images
 if is_edge; then
-	tag_and_push ${REPO}:build-${VERSION} ${REPO}:${IMAGE_TAG_EDGE} # Example tag: edge-php7.3
+	tag_and_push ${REPO}:${BUILD_TAG} ${REPO}:${IMAGE_TAG_EDGE}
 elif is_stable; then
-	tag_and_push ${REPO}:build-${VERSION} ${REPO}:${IMAGE_TAG_STABLE} # Example tag: php7.3
+	tag_and_push ${REPO}:${BUILD_TAG} ${REPO}:${IMAGE_TAG_STABLE}
 elif is_release; then
 	# Have stable, major, minor tags match
-	tag_and_push ${REPO}:build-${VERSION} ${REPO}:${IMAGE_TAG_STABLE} # Example tag: php7.3
-	tag_and_push ${REPO}:build-${VERSION} ${REPO}:${IMAGE_TAG_RELEASE_MAJOR}  # Example tag: 2-php7.3
-	tag_and_push ${REPO}:build-${VERSION} ${REPO}:${IMAGE_TAG_RELEASE_MAJOR_MINOR}  # Example tag: 2.7-php7.3
+	tag_and_push ${REPO}:${BUILD_TAG} ${REPO}:${IMAGE_TAG_STABLE}
+	tag_and_push ${REPO}:${BUILD_TAG} ${REPO}:${IMAGE_TAG_RELEASE_MAJOR}
+	tag_and_push ${REPO}:${BUILD_TAG} ${REPO}:${IMAGE_TAG_RELEASE_MAJOR_MINOR}
 else
 	# Exit if not on develop, master or release tag
 	exit
@@ -86,7 +80,5 @@ fi
 # Special case for the "latest" tag
 # Push (base image only) on stable and release builds
 if is_latest && (is_stable || is_release); then
-	echo "Pushing ${REPO}:${IMAGE_TAG_LATEST} image ..."
-	docker tag ${REPO}:build-${VERSION} ${REPO}:${IMAGE_TAG_LATEST}
-	docker push ${REPO}:${IMAGE_TAG_LATEST}
+	tag_and_push ${REPO}:${BUILD_TAG} ${REPO}:${IMAGE_TAG_LATEST}
 fi
diff --git a/tests/test.bats b/tests/test.bats
index e3f6e501..3c94731b 100755
--- a/tests/test.bats
+++ b/tests/test.bats
@@ -156,7 +156,9 @@ _healthcheck_wait ()
 	unset output
 
 	output=$(echo "$phpInfo" | grep "memory_limit")
-	echo "$output" | grep "1024M => 1024M"
+	# grep expression cannot start with "-", so prepending the expression with "memory_limit" here.
+	# Another option is to do "grep -- '-...'".
+	echo "$output" | grep "memory_limit => -1 => -1"
 	unset output
 
 	output=$(echo "$phpInfo" | grep "sendmail_path")