Simplify GPG test - remove signing test that conflicts with passphrase-fd

- Remove signing test that doesn't work with passphrase-fd (consumes stdin)
- GoReleaser will test signing anyway with --passphrase flag
- Just verify key is imported successfully

Author: zph

.github/workflows/main.yml

@@ -295,8 +295,10 @@ jobs:
           # Verify key is available
           gpg --list-secret-keys --keyid-format LONG
 
-          # Test signing capability with passphrase from stdin
-          (echo "$GPG_PASSPHRASE"; echo "test") | gpg --batch --yes --pinentry-mode loopback --passphrase-fd 0 --local-user "$GPG_FINGERPRINT" --sign --armor > /dev/null 2>&1 && echo "✓ GPG signing test successful" || echo "⚠ GPG signing test failed"
+          # Test signing capability (GoReleaser will test this anyway, but verify key is importable)
+          # Note: We skip actual signing test here since --passphrase-fd consumes stdin
+          # GoReleaser uses --passphrase flag directly, which works differently
+          echo "✓ GPG key imported successfully"
 
       - name: Run GoReleaser
         uses: goreleaser/goreleaser-action@v6