Extract version from tag

Signed-off-by: Lehmann_Fabian <fabian.lehmann@informatik.hu-berlin.de>

Author: Lehmann-Fabian

.github/workflows/workflow.yml

@@ -15,6 +15,8 @@ jobs:
         with:
           username: commonworkflowscheduler
           password: ${{ secrets.DOCKER_PASSWORD }}
+      - name: Extract version from tag
+        run: echo "VERSION=${GITHUB_REF#refs/tags/}" >> $GITHUB_ENV
       - name: Build and push Docker image
         uses: docker/build-push-action@v4
         with: