Adding Velero

Summary

Velero will be used as part of our blue-green strategy for our DSOP clusters on the low side and for mission apps on the high side.

Relevant logs/screenshots

N/A

/cc @joshwolf @runyontr

chart/values.yaml

@@ -659,10 +659,7 @@ addons:
     git:
       repo: https://repo1.dso.mil/platform-one/big-bang/apps/sandbox/velero.git
       path: "./chart"
-      # tag: "1.1.0"
-      branch: "velero-1"
-      commit: "4685ea1b7cabeaf8394be2737f9e7ce1b2e8c05f"
-
+      tag: "2.14.8-bb.0"
     values:
       # Requires at least one plugin installed. Current supported values: aws, azure
       plugins: []