Add version extraction step to release workflow

Signed-off-by: Anton Engelhardt <[email protected]>

.github/workflows/release.yml

@@ -37,9 +37,14 @@ jobs:
           username: ${{ secrets.DOCKERHUB_USERNAME }}
           password: ${{ secrets.DOCKERHUB_PASSWORD }}
 
+      - name: Extract version from Github Ref
+        id: extract_version
+        run: |
+          echo VERSION=${echo ${{ github.ref }} | grep -o "v[0-9]\+\.[0-9]\+\.[0-9]\+"} >> $GITHUB_ENV
+
       - name: Push to Docker Hub
         uses: docker/build-push-action@v2
         with:
           context: .
           push: true
-          tags: antonengelhardt/wasm-oidc-plugin:${{ github.ref }}
+          tags: antonengelhardt/wasm-oidc-plugin:${{ env.VERSION }}