Automate deploy to Google Cloud Functions Gen2 from GitHub Actions

[gepser]

Problem

Deploy is currently manual via gcloud functions deploy, so releases depend on local steps and can drift from the repository state.

Goal

Deploy automatically to Google Cloud Functions Gen2 when changes are merged to master.

Proposed solution

Create a GitHub Actions deploy workflow using Workload Identity Federation (OIDC) and the official Google GitHub Actions.

Scope

• Add .github/workflows/deploy.yml.
• Trigger on push to master and workflow_dispatch.
• Use google-github-actions/auth with workload identity provider + service account.
• Deploy function progress in project progress-markdown, region us-central1, runtime go124, entry point Progress.
• Add optional post-deploy smoke test step (reusing scripts/smoke.sh).
• Document required GitHub repository secrets/variables and one-time GCP IAM setup.

Acceptance criteria

• Merge to master triggers deploy workflow automatically.
• Workflow can also be run manually.
• Deployment succeeds without long-lived JSON keys.
• README includes setup instructions for GitHub-to-GCP auth and deploy automation.

Notes

Use OIDC/WIF only (no service account key files).

[gepser]

Implemented in PR #16: #16

Includes:

• Automated deploy workflow on master + manual dispatch
• OIDC/WIF auth via google-github-actions/auth
• Cloud Functions Gen2 deploy action
• Post-deploy smoke validation
• README setup and IAM instructions