Bug fixes (#427)

* Call the base container entrypoint with proper arguments

* Build the app container using path to directory

* Add CONTRIBUTING.md

CONTRIBUTING.md

@@ -0,0 +1,5 @@
+# Code Contribution Guidelines
+
+Thank you for your interest in contributing! Please see the [Mattermost Contribution Guide](https://developers.mattermost.com/contribute/getting-started/) which describes the process for making code contributions across Mattermost projects and [join our "Contributors" community channel](https://community.mattermost.com/core/channels/tickets) to ask questions from community members and the Mattermost core team.
+
+When you submit a pull request, it goes through a [code review process outlined here](https://developers.mattermost.com/contribute/getting-started/code-review/).

db/entrypoint.sh

@@ -58,5 +58,5 @@ if [ "$1" = 'postgres' ]; then
   update_conf $wal_enable
 
   # Run the postgresql entrypoint
-  . /docker-entrypoint.sh
+  docker-entrypoint.sh postgres
 fi

docker-compose.yml

@@ -20,8 +20,7 @@ services:
     #  - AWS_REGION=us-east-1
 
   app:
-    build:
-      context: app
+    build: app
       # uncomment following lines for team edition or change UID/GID
       # args:
       #   - edition=team