Change images to alpine where possible

apache/Dockerfile

@@ -1,6 +1,6 @@
-FROM httpd:2.4
+FROM httpd:2.4-alpine
 
-RUN apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -y \
+RUN apk add --no-cache --update \
     nano \
     openssl \
     gettext

apache/entrypoint.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/sh
 
 # if there's no ssl certificate yet create it
 if [ ! -f "/usr/local/apache2/conf/server.crt" ]; then

docker-compose.yml

@@ -8,7 +8,7 @@ services:
   # docker-compose -f docker-compose.yml -f compose/nginx.yml -f compose/pgsql.yml -f compose/php.yml up -d pgsql php-7.3
 
   nodejs:
-    image: node:16
+    image: node:16-alpine
     container_name: totara_nodejs
     environment:
       TZ: ${TIME_ZONE}
@@ -28,7 +28,7 @@ services:
       - totara
 
   redis:
-    image: redis
+    image: redis:alpine
     # activate persistency
     command: "redis-server --appendonly yes"
     environment:
@@ -39,7 +39,7 @@ services:
       - totara
 
   memcached:
-    image: memcached
+    image: memcached:alpine
     environment:
       TZ: ${TIME_ZONE}
     networks:

nginx/Dockerfile

@@ -1,8 +1,8 @@
-FROM nginx:1.20
+FROM nginx:1.20-alpine
 
 ENV REMOTE_DATA=${REMOTE_DATA}
 
-RUN apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -y \
+RUN apk add --no-cache --update \
     nano \
     openssl \
     gettext

nginx/entrypoint.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/sh
 
 # if there's no ssl certificate yet create it
 if [ ! -f "/etc/nginx/ssl/domain.crt" ]