chore(deps): upgrade to postgres 18 and latest mattermost patch release

This revision bumps postgres from version 14 to the latest supported
release, version 18. In version 18, the format of the persistent storage
volume changed to improve ease of database upgrades. To accomodate this,
the volume mounts for the postgres service in docker compose was
adjusted. Refer to the upstream documentation for more details.

Additionally, mattermost was upgraded to the latest patch release
10.11.7 which includes some low- to medium-severity security fixes.

Author: brandon1024

docker-compose.yml

@@ -11,7 +11,7 @@ services:
       - /tmp
       - /var/run/postgresql
     volumes:
-      - ${POSTGRES_DATA_PATH}:/var/lib/postgresql/data
+      - ${POSTGRES_DATA_PATH}:/var/lib/postgresql
     environment:
       # timezone inside container
       - TZ

env.example

@@ -14,7 +14,7 @@ RESTART_POLICY=unless-stopped
 ## Please keep in mind this will create a superuser and it's recommended to use a less privileged
 ## user to connect to the database.
 ## A guide on how to change the database user to a nonsuperuser can be found in docs/creation-of-nonsuperuser.md
-POSTGRES_IMAGE_TAG=14-alpine
+POSTGRES_IMAGE_TAG=18-alpine
 POSTGRES_DATA_PATH=./volumes/db/var/lib/postgresql/data
 
 POSTGRES_USER=mmuser
@@ -63,7 +63,7 @@ MM_BLEVESETTINGS_INDEXDIR=/mattermost/bleve-indexes
 ## This will be 'mattermost-enterprise-edition' or 'mattermost-team-edition' based on the version of Mattermost you're installing.
 MATTERMOST_IMAGE=mattermost-enterprise-edition
 ## Update the image tag if you want to upgrade your Mattermost version. You may also upgrade to the latest one. The example is based on the latest Mattermost ESR version.
-MATTERMOST_IMAGE_TAG=10.11.5
+MATTERMOST_IMAGE_TAG=10.11.7
 
 ## Make Mattermost container readonly. This interferes with the regeneration of root.html inside the container. Only use
 ## it if you know what you're doing.