ci: add provenance to npm packages (#252)

This commit adds provenance for all published packages. See the NPM documentation [0].

Provenance will allow people to verify that the packages were actually built on GH Actions and with the content of the corresponding commit. This will help with supply chain security.

For this to work, the `id-token` permission was added only where necessary.

[0]: https://docs.npmjs.com/generating-provenance-statements

.github/workflows/release-insiders.yml

@@ -6,6 +6,7 @@ on:
 
 permissions:
   contents: read
+  id-token: write
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
@@ -57,6 +58,6 @@ jobs:
         run: npm version 0.0.0-${{ env.RELEASE_CHANNEL }}.${{ env.SHA_SHORT }} --force --no-git-tag-version
 
       - name: Publish
-        run: npm publish --tag ${{ env.RELEASE_CHANNEL }}
+        run: npm publish --provenance --tag ${{ env.RELEASE_CHANNEL }}
         env:
           NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}

.github/workflows/release.yml

@@ -6,6 +6,7 @@ on:
 
 permissions:
   contents: read
+  id-token: write
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
@@ -52,6 +53,6 @@ jobs:
           echo "RELEASE_CHANNEL=$(npm run release-channel --silent)" >> $GITHUB_ENV
 
       - name: Publish
-        run: npm publish --tag ${{ env.RELEASE_CHANNEL }}
+        run: npm publish --provenance --tag ${{ env.RELEASE_CHANNEL }}
         env:
           NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}