add openvsx publishing

Summary:
[issue](facebook/pyre-check#975 (comment))

I mistakenly tried adding support from [this](EclipseFdn/publish-extensions#842 (comment)) repo. Instead we should be doing it ourselves.

Reviewed By: stroxler

Differential Revision: D72345263

fbshipit-source-id: 9f9084282048749dab5119caa0afdc8be663b885

Author: kinto0

Diff for: .github/workflows/deploy_extension.yml

@@ -10,7 +10,7 @@ jobs:
     build:
         uses: ./.github/workflows/build_extension.yml
 
-    publish:
+    publish_code_marketplace:
         runs-on: ubuntu-latest
         needs: build
         if: success()
@@ -21,3 +21,13 @@ jobs:
               run: npx vsce publish --packagePath $(find . -iname *.vsix)
               env:
                 VSCE_PAT: ${{ secrets.VSCE_PAT }}
+
+    publish_openvsx:
+        runs-on: ubuntu-latest
+        needs: build
+        if: success()
+        steps:
+            - name: upload
+              uses: actions/download-artifact@v4
+            - name: publish
+              run: npx ovsx publish --packagePath $(find . -iname *.vsix) --pat ${{ secrets.OPENVSX_TOKEN }}