Merge branch 'mattermost-secret-envs' into 'master'

Mattermost - ENV changes

See merge request platform-one/big-bang/bigbang!400

chart/values.yaml

@@ -584,7 +584,7 @@ addons:
     git:
       repo: https://repo1.dso.mil/platform-one/big-bang/apps/collaboration-tools/mattermost.git
       path: "./chart"
-      tag: "0.1.2-bb.0"
+      tag: "0.1.3-bb.0"
 
     # -- Mattermost Enterprise functionality.
     enterprise: