ACAS-716: fix dev tagging logic

.github/workflows/trigger-tag.yml

@@ -24,7 +24,7 @@ jobs:
       # and 2022.1.1-dev9 will become 2022.1.1-dev10
       - name: Get next dev tag name
         run: |
-          LAST_TAG=$(git tag --sort=v:refname --merged ${{ env.BRANCH_NAME }} | grep -e '-dev' | tail -1)
+          LAST_TAG=$(git tag --sort=v:refname --merged ${{ env.BRANCH_NAME }} | grep -E '^[0-9]{4}\.[0-9]+\.[0-9]+-dev[0-9]+$' | tail -1)
           echo "NEXT_TAG=$(echo $LAST_TAG | awk -F-dev -v OFS=-dev '{$NF += 1 ; print}')" >> $GITHUB_ENV
       # Trigger the build
       - name: Trigger the tagger workflow with branch ${{env.BRANCH_NAME}} and tag ${{ env.NEXT_TAG }}