WORKFLOW: added calculation for generating a vaild tag for automated PR builds [skip ci]

.github/workflows/cooker-selfhosted-persistent.yml

@@ -113,16 +113,27 @@ jobs:
       # if it's a feature branch it will not marked as "latest" cooker version
       - name: "Set makeLatest (cooker only)"
         run: |
-          if [[ "$BRANCH_NAME" == 'feat/'* ]]; then
+          if [[ "$BRANCH_NAME" == 'feat/'* || "$BRANCH_NAME" == 'ref/'* ]]; then
             echo "MAKE_LATEST=false" >> $GITHUB_ENV
           else
             echo "MAKE_LATEST=true" >> $GITHUB_ENV
           fi
 
+      # if the branch is coming from a PR the tag should be manually built
+      - name: "Generate version tag"
+        run: |
+          if [[ "$BRANCH_NAME" == 'ref/'* ]]; then
+            pr_number=$(echo ${{env.BRANCH_NAME}} | awk -F'/' '{print $3}')
+            original_branch=$(git ls-remote --heads origin "refs/pull/$pr_number/head" | cut -d'/' -f3)
+            echo "TAG=PR-$pr_number-$original_branch-${{ env.buildid }}" >> $GITHUB_ENV
+          else
+            echo "TAG=${{env.BRANCH_NAME}}-${{ env.buildid }}" >> $GITHUB_ENV
+          fi
+
       - name: Publish the flatpak in a new cooker release
         uses: ncipollo/release-action@v1
         with:
-          tag: "${{env.BRANCH_NAME}}-${{ env.buildid }}"
+          tag: "${{env.TAG}}"
           body: |
             # Release Notes (Cooker)
             This is a cooker snapshot based on the commit: ${{ github.event.repository.full_name }}@${{github.sha}}.