ci: extract release tag

.github/workflows/release.yaml

@@ -10,13 +10,19 @@ jobs:
     runs-on: ubuntu-20.04
     outputs:
       upload_url: ${{ steps.create_release.outputs.upload_url }}
+      release_tag: ${{ steps.extract_tag.outputs.tag }}
     steps:
       # Generate the release changelog from commits since the last release
       - name: Build Changelog
         id: build_changelog
         uses: mikepenz/[email protected]
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+      # Extract the tag
+      # see: https://stackoverflow.com/a/58178121/4705719
+      - name: Extract Release Tag
+        id: extract_tag
+        run: echo ::set-output name=tag::${GITHUB_REF#refs/*/}
       # Create and upload assets to a release
       - name: Create Release
         id: create_release
@@ -60,10 +66,11 @@ jobs:
       - name: Build with Maven
         env:
           ELASTICSEARCH_VERSION: ${{ matrix.elasticsearch }}
+          ZENTITY_VERSION: ${{ needs.create_release.outputs.release_tag }}
         run: |
           mvn --batch-mode clean package \
-              -Delasticsearch.version=${{ matrix.elasticsearch }} \
-              -Dzentity.version=${{ github.ref }} \
+              -Delasticsearch.version=${ELASTICSEARCH_VERSION} \
+              -Dzentity.version=${ZENTITY_VERSION} \
               --file pom.xml
       - name: Upload Release Asset
         id: upload_release_asset