Merge branch 'mattermost-and-op-upgrade' into 'master'

Mattermost and operator upgrade

Closes platform-one/big-bang/apps/collaboration-tools/mattermost-operator#18 and platform-one/big-bang/apps/collaboration-tools/mattermost#47

See merge request platform-one/big-bang/bigbang!1563

chart/values.yaml

@@ -1149,7 +1149,7 @@ addons:
     git:
       repo: https://repo1.dso.mil/platform-one/big-bang/apps/collaboration-tools/mattermost-operator.git
       path: "./chart"
-      tag: "1.17.0-bb.3"
+      tag: "1.18.0-bb.0"
 
     # -- Flux reconciliation overrides specifically for the Mattermost Operator Package
     flux: {}
@@ -1166,7 +1166,7 @@ addons:
     git:
       repo: https://repo1.dso.mil/platform-one/big-bang/apps/collaboration-tools/mattermost.git
       path: "./chart"
-      tag: "0.7.0-bb.1"
+      tag: "6.6.0-bb.0"
 
     # -- Flux reconciliation overrides specifically for the Mattermost Package
     flux: {}