Fix docker-compose to specific image version by default

Author: milot-mirdita

docker-compose/.env

@@ -1 +1,2 @@
 PORT=8877
+TAG=version-2

docker-compose/docker-compose.yml

@@ -7,7 +7,7 @@ services:
       - redis-volume:/var/lib/redis
 
   mmseqs-web-api:
-    image: soedinglab/mmseqs2-app-backend
+    image: "soedinglab/mmseqs2-app-backend:${TAG}"
     command: -server -config /etc/mmseqs-web/config.json
     depends_on:
       - mmseqs-web-redis
@@ -19,7 +19,7 @@ services:
       - ./jobs:/opt/mmseqs-web/jobs
 
   mmseqs-web-worker:
-    image: soedinglab/mmseqs2-app-backend
+    image: "soedinglab/mmseqs2-app-backend:${TAG}"
     command: -worker -config /etc/mmseqs-web/config.json
     depends_on:
       - mmseqs-web-api
@@ -32,7 +32,7 @@ services:
       - /tmp:exec
 
   mmseqs-web-webserver:
-    image: soedinglab/mmseqs2-app-frontend
+    image: "soedinglab/mmseqs2-app-frontend:${TAG}"
     depends_on:
       - mmseqs-web-api
     volumes: