parameterized docker image tags

.env

@@ -4,3 +4,7 @@ ALFRESCO_LICENSE_DIR=~/alfresco/license
 PROXY_PROTOCOL=http
 PROXY_HOST=localhost
 PROXY_PORT=8080
+
+ACS_TAG=7.3.0
+AAMQ_TAG=5.17.1-jre17-centos7
+POSTGRES_TAG=13

docker-compose.yml

@@ -4,7 +4,7 @@ version: "3"
 
 services:
     platform:
-        image: alfresco/alfresco-content-repository-community:7.3.0
+        image: alfresco/alfresco-content-repository-community:${ACS_TAG}
         environment:
             JAVA_TOOL_OPTIONS: "
                 -Dencryption.keystore.type=JCEKS
@@ -28,10 +28,10 @@ services:
             - activemq
     
     postgres-acs:
-        image: postgres:13
+        image: postgres:${POSTGRES_TAG}
 
     activemq:
-        image: alfresco/alfresco-activemq:5.17.1-jre17-centos7
+        image: alfresco/alfresco-activemq:${AAMQ_TAG}
 
     proxy:
         build: ./nginx-ingress