Merge branch 'update-authservice-tag-0.5.1-bb.4' into 'master'

Added authservice Contributing.md

Closes platform-one/big-bang/apps/core/authservice#45

See merge request platform-one/big-bang/bigbang!1862

chart/values.yaml

@@ -716,7 +716,7 @@ addons:
     git:
       repo: https://repo1.dso.mil/platform-one/big-bang/apps/core/authservice.git
       path: "./chart"
-      tag: "0.5.1-bb.3"
+      tag: "0.5.1-bb.4"
 
     # -- Flux reconciliation overrides specifically for the Authservice Package
     flux: {}