chore: fix release branch resolution (Mellanox#1262)

Author: heyvister1

.github/workflows/release.yaml

@@ -16,7 +16,7 @@ jobs:
           echo "RELEASE_VERSION=`echo $ISSUE_TITLE | awk '{ print $2 }'`" >> $GITHUB_ENV
       - name: Determine base branch
         run: |
-          echo "BASE_BRANCH=${{ contains(env.RELEASE_VERSION, 'beta') && 'master' || env.RELEASE_VERSION }}" >> $GITHUB_ENV
+          echo "BASE_BRANCH=$(echo $RELEASE_VERSION | grep -q 'beta' && echo 'master' || echo ${RELEASE_VERSION%%.*}.${RELEASE_VERSION#*.}.x)" >> $GITHUB_ENV
       - run: |
           git config user.name  nvidia-ci-cd
           git config user.email [email protected]
@@ -53,13 +53,16 @@ jobs:
           path: sriov-network-operator-fork
       - run:
           echo "RELEASE_VERSION=`echo $ISSUE_TITLE | awk -F 'Release v' '{ print $2 }'`" >> $GITHUB_ENV
+      - name: Determine sriov-network-operator branch
+        run: |
+          echo "BASE_BRANCH=$(echo network-operator-${RELEASE_VERSION%%.*}.${RELEASE_VERSION#*.}.x)" >> $GITHUB_ENV
       - name: Create tag to trigger PR that update image tags in network-operator values
         run: |
           cd sriov-network-operator-fork
           git config user.name  nvidia-ci-cd
           git config user.email [email protected]
 
-          git checkout -b $RELEASE_VERSION origin/network-operator-$RELEASE_VERSION
+          git checkout -b $RELEASE_VERSION origin/$BASE_BRANCH
           git tag $RELEASE_VERSION
           git push origin --tags