Add a Github Workflow for publishig the extension to Open VSX

Author: muhammadsammy

.github/workflows/publish-extension.yaml

@@ -0,0 +1,24 @@
+name: Publish Extension
+
+on:
+  release:
+    types:
+        - released
+
+
+jobs:
+  publish-extension:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+
+      - uses: actions/setup-node@v1
+        with:
+          node-version: 12
+
+      - run: npm ci
+
+      - name: Publish to Open VSX Registry
+        uses: HaaLeo/publish-vscode-extension@v0
+        with:
+          pat: ${{ secrets.OPEN_VSX_TOKEN }}