fix: use GitHub Actions expression syntax for VERSION

.gitea/workflows/release-tag.yml

@@ -32,17 +32,20 @@ jobs:
           cache: false
 
       - name: Build
+        env:
+          GOPRIVATE: git.marketally.com
+          VERSION: ${{ github.ref_name }}
         run: |
-          VERSION=${GITHUB_REF#refs/tags/v}
+          # Strip the v prefix from tag
+          VERSION="${VERSION#v}"
           EXT=""
           if [ "${{ matrix.goos }}" = "windows" ]; then
             EXT=".exe"
           fi
+          echo "Building version: ${VERSION}"
           CGO_ENABLED=0 GOOS=${{ matrix.goos }} GOARCH=${{ matrix.goarch }} \
             go build -ldflags "-X gitea.com/gitea/act_runner/internal/pkg/ver.version=${VERSION}" \
             -o act_runner-${{ matrix.goos }}-${{ matrix.goarch }}${EXT}
-        env:
-          GOPRIVATE: git.marketally.com
 
       - name: Upload artifact
         uses: actions/upload-artifact@v3