ci: add skipDuplicate to publish workflow for idempotent releases

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: 2 people

.github/workflows/publish-extension.yml

@@ -49,6 +49,7 @@ jobs:
         with:
           pat: ${{ secrets.VSCE_PAT }}
           registryUrl: https://marketplace.visualstudio.com
+          skipDuplicate: true
           dryRun: ${{ inputs.dry_run == 'true' }}
 
       - name: Publish to Open VSX
@@ -57,6 +58,7 @@ jobs:
           pat: ${{ secrets.OPEN_VSX_TOKEN }}
           registryUrl: https://open-vsx.org
           extensionFile: ${{ steps.publish-vscode.outputs.vsixPath }}
+          skipDuplicate: true
           dryRun: ${{ inputs.dry_run == 'true' }}
 
       - name: Upload VSIX to Release