ci: Run nightly canary release for braintrust package

.github/workflows/publish-js-sdk-canary-scheduler.yaml

@@ -0,0 +1,47 @@
+# This workflow is responsible for scheduling the JavaScript SDK canary publish workflow on a daily basis.
+# The actual publish workflow is defined in `publish-js-sdk.yaml`, which is triggered by this scheduler workflow.
+# `publish-js-sdk.yaml` has to be where the publish actually happens so that npm trusted publishing still works.
+# npm trusted publishing that only one workflow can publish to npm.
+
+name: Schedule JavaScript SDK Canary Publish
+
+concurrency:
+  group: publish-js-sdk-canary-scheduler
+  cancel-in-progress: false
+
+on:
+  schedule:
+    - cron: "17 6 * * *"
+  workflow_dispatch:
+
+jobs:
+  dispatch-canary-publish:
+    runs-on: ubuntu-latest
+    timeout-minutes: 5
+    permissions:
+      actions: write
+    steps:
+      - name: Dispatch publish workflow
+        uses: actions/github-script@ed597411d8f924073f98dfc5c65a23a2325f34cd # v8.0.0
+        with:
+          script: |
+            await github.rest.actions.createWorkflowDispatch({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              workflow_id: "publish-js-sdk.yaml",
+              ref: "main",
+              inputs: {
+                release_type: "canary",
+                branch: "main",
+              },
+            });
+
+      - name: Summarize dispatch
+        run: |
+          {
+            echo "## JavaScript SDK Canary Dispatch Queued"
+            echo
+            echo "- Workflow: \`publish-js-sdk.yaml\`"
+            echo "- Release type: \`canary\`"
+            echo "- Branch: \`main\`"
+          } >> "$GITHUB_STEP_SUMMARY"