Add publishing workflow

.github/workflows/build.yaml

@@ -26,7 +26,7 @@ jobs:
         with:
           setup_only: true
       - name: install-deps
-        run: make install
+        run: npm ci
       - name: build
         run: npm run compile
       - name: prepworkspaces

.github/workflows/publish.yaml

@@ -0,0 +1,63 @@
+name: Publish Extension
+
+on:
+  release:
+    types: [published, prereleased]
+
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+      - uses: actions/setup-node@v6
+        with:
+          node-version-file: ".nvmrc"
+          cache: "npm"
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Run tests
+        run: npm test
+
+      - name: Package extension (regular)
+        if: github.event.release.prerelease == false
+        run: npm run package
+      - name: Package extension (pre-release)
+        if: github.event.release.prerelease == true
+        run: npm run package:prerelease
+
+      - name: Set up git credentials
+        run: |
+          git config user.name "${{ github.actor }}"
+          git config user.email "${{ github.actor }}@users.noreply.github.com"
+
+      - name: Publish to VS Code Marketplace (regular)
+        if: github.event.release.prerelease == false
+        # NOTE: ${{github.event.release.tag_name}} is the tag name from the release.
+        # Ref: https://docs.github.com/en/actions/reference/workflows-and-actions/events-that-trigger-workflows#release
+        # Using `@vscode/vsce publish <version>` will tag a new commit with the version in package.json.
+        # Ref: https://code.visualstudio.com/api/working-with-extensions/publishing-extension#autoincrement-the-extension-version
+        run: npm exec @vscode/vsce publish ${{ github.event.release.tag_name }} --packagePath *.vsix
+        env:
+          VSCE_PAT: ${{ secrets.VSCE_PAT }}
+      - name: Publish to VS Code Marketplace (pre-release)
+        if: github.event.release.prerelease == true
+        run: npm exec @vscode/vsce publish ${{ github.event.release.tag_name }} --pre-release --packagePath *.vsix
+        env:
+          VSCE_PAT: ${{ secrets.VSCE_PAT }}
+
+      - name: Push version commit
+        run: |
+          git push origin HEAD:${{ github.event.repository.default_branch }}
+
+      - name: Publish to OpenVSX (regular)
+        if: github.event.release.prerelease == false
+        run: npm exec ovsx publish *.vsix
+        env:
+          OVSX_PAT: ${{ secrets.OVSX_PAT }}
+      - name: Publish to OpenVSX (pre-release)
+        if: github.event.release.prerelease == true
+        run: npm exec ovsx publish *.vsix --pre-release
+        env:
+          OVSX_PAT: ${{ secrets.OVSX_PAT }}