ci: Make attestation runs on every release (stable)

Sometimes build will not be made due to CI Configuration

.github/workflows/release.yml

@@ -67,6 +67,7 @@ jobs:
           npx semantic-release
           
       - name: Generate artifact attestation
+        if: github.ref == 'refs/heads/main'
         uses: actions/attest-build-provenance@v1
         with:
           subject-path: build/app/outputs/apk/release/revanced-manager-*.apk