[test] test ssh into GCP from GH Actions

.github/workflows/test.yml

@@ -0,0 +1,35 @@
+name: test
+run-name: test run
+
+on:
+  workflow_dispatch:
+
+jobs:
+  default-job:
+    permissions:
+      contents: 'read'
+      id-token: 'write'
+    runs-on: ubuntu-22.04
+
+    steps:
+      - name: Get GCP_ env variables from empower-config/.gcloudrc
+        run: |
+          source empower-config/.gcloudrc 
+          echo "GCP_WORKLOAD_IDENTITY_PROVIDER=$GCP_WORKLOAD_IDENTITY_PROVIDER" >> $GITHUB_OUTPUT
+          echo "GCP_SERVICE_ACCOUNT=$GCP_SERVICE_ACCOUNT" >> $GITHUB_OUTPUT 
+        id: gcloudrc
+
+      - id: 'auth'
+        name: 'Authenticate Google Cloud'
+        uses: 'google-github-actions/auth@v0'
+        with:
+          workload_identity_provider: ${{ steps.gcloudrc.outputs.GCP_WORKLOAD_IDENTITY_PROVIDER }}
+          service_account: ${{ steps.gcloudrc.outputs.GCP_SERVICE_ACCOUNT }}
+
+      - name: 'Set up Google Cloud SDK'
+        uses: 'google-github-actions/setup-gcloud@v0'
+
+      - name: 'Try ssh-ing into GCP host'
+        run: gcloud compute ssh empower-tda-and-crons --zone us-central1-a
+
+      - run: echo "Job status is ${{ job.status }}."