#6 refactor: use AMI from mappings

.editorconfig

@@ -8,3 +8,6 @@ insert_final_newline = true
 
 [*.{yml,yaml}]
 indent_size = 2
+
+[Makefile]
+indent_style = tab

Makefile

@@ -0,0 +1,30 @@
+.PHONY: list-instance-types list-latest-amis
+
+list-instance-types:
+	@instance_types=$$( \
+		aws pricing get-attribute-values \
+			--service-code AmazonEC2 \
+			--attribute-name instanceType \
+			--region us-east-1 \
+			--query 'AttributeValues[].Value' \
+			--output text \
+	); \
+	for instance_type in $$instance_types; do \
+		printf ' - '\''%s'\''\n' $$instance_type; \
+	done
+
+list-latest-amis:
+	@for region in $$(aws ec2 describe-regions --query 'Regions[].RegionName' --output text); do \
+		ami_id=$$( \
+			aws ec2 describe-images \
+				--owners amazon \
+				--filters 'Name=name,Values=amzn2-ami-hvm-*-gp2' \
+					'Name=image-type,Values=machine' \
+					'Name=virtualization-type,Values=hvm' \
+					'Name=architecture,Values=x86_64' \
+				--region $$region \
+				--query 'reverse(sort_by(Images, &CreationDate))[0].ImageId' \
+				--output text \
+		); \
+		printf '%s:\n  %s: '\''%s'\''\n' $$region 'AmiId' $$ami_id; \
+	done