Update release script to handle -rc (#773)

## Description


Update release script to handle `-rc`

## Why is this needed



Fixes: #

## How Has This Been Tested?





## How are existing users impacted? What migration steps/scripts do we need?





## Checklist:

I have:

- [ ] updated the documentation and/or roadmap (if required)
- [ ] added unit or e2e tests
- [ ] provided instructions on how to upgrade

contrib/tag-release.sh

@@ -8,8 +8,8 @@ if [ -z "${1-}" ]; then
 fi
 
 new_tag=${1-}
-[[ $new_tag =~ ^v[0-9]*\.[0-9]*\.[0-9]*$ ]] || (
-	echo "Tag must be in the form of vX.Y.Z"
+[[ $new_tag =~ ^v[0-9]*\.[0-9]*\.[0-9]?(-rc[1-9])*$ ]] || (
+	echo "Tag must be in the form of vX.Y.Z or vX.Y.Z-rc1"
 	exit 1
 )