[MM] Bump alpine to 3.17, MM to 7.7.1 and pass MM_VERSION arg in docker-compose

mattermost/Dockerfile

@@ -1,10 +1,10 @@
-FROM alpine:3.11
+FROM alpine:3.17
 
 # Some ENV variables
 ENV PATH="/mattermost/bin:${PATH}"
-ENV MM_VERSION=7.5.2
 
 # Build argument to set Mattermost edition
+ARG MM_VERSION
 ARG PUID=2000
 ARG PGID=2000
 

mattermost/docker-compose.yml

@@ -11,8 +11,11 @@ services:
     env_file: secrets/db.secrets
 
   app:
-    build: .
-    image: mm_app:7.5.2
+    image: mm_app:7.7.1
+    build:
+      context: .
+      args:
+        MM_VERSION: 7.7.1
     depends_on:
       - db
     restart: unless-stopped