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richardthe3rd merged 3 commits into from
Dec 11, 2025
Merged

Configure CI workflows to run once per PR push #129

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96cd74e
Initial plan
Copilot Dec 11, 2025
e16a287
Configure CI to run only once on PR pushes
Copilot Dec 11, 2025
6ddd94e
Update CI/CD documentation with single-run configuration
Copilot Dec 11, 2025
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2 changes: 1 addition & 1 deletion .github/workflows/build-deploy.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -2,7 +2,7 @@ name: Flutter App CI/CD

on:
push:
branches: [main, copilot/**]
branches: [main]
pull_request:
branches: [main]
workflow_dispatch:
Expand Down
1 change: 0 additions & 1 deletion .github/workflows/cloudflare-worker.yml
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Expand Up @@ -8,7 +8,6 @@ on:
- 'data/festivals.json'
- '.github/workflows/cloudflare-worker.yml'
pull_request:
branches: [main]
paths:
- 'cloudflare-worker/**'
- 'data/festivals.json'
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1 change: 0 additions & 1 deletion .github/workflows/devcontainer.yml
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Expand Up @@ -9,7 +9,6 @@ on:
- 'mise.dev.toml'
- '.github/workflows/devcontainer.yml'
pull_request:
branches: [main]
paths:
- '.devcontainer/**'
- 'mise.toml'
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64 changes: 58 additions & 6 deletions docs/CICD.md
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Expand Up @@ -8,7 +8,7 @@ The project uses **3 separate workflows** to handle different aspects of the CI/

| Workflow | File | Purpose | Triggers |
|----------|------|---------|----------|
| **Flutter App CI/CD** | `build-deploy.yml` | Build, test, and deploy Flutter app | Push to `main`, PRs, copilot branches |
| **Flutter App CI/CD** | `build-deploy.yml` | Build, test, and deploy Flutter app | Push to `main`, PRs to `main` |

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This line still references "copilot branches" in the table, but the workflow changes remove support for copilot/** branches. The triggers column should be updated to reflect the new configuration: "Push to main, PRs to main".

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This was already fixed in commit 6ddd94e. The table now correctly shows "Push to main, PRs to main" without any reference to copilot branches.

| **Cloudflare Worker** | `cloudflare-worker.yml` | Deploy API proxy worker and festivals data | Push to `main`, PRs (when worker/festivals.json changes) |
| **Release Web** | `release-web.yml` | Production web releases to Cloudflare Pages | Version tags (`v*`) |

Expand All @@ -28,17 +28,18 @@ Handles all Flutter app building, testing, and deployment workflows for staging,
```yaml
on:
push:
branches: [main, copilot/**]
branches: [main]

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This code example still shows the old configuration with branches: [main, copilot/**]. It should be updated to match the actual workflow file which now only has branches: [main].

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This was already fixed in commit 6ddd94e. The code example now shows branches: [main] only (without copilot/**) to match the actual workflow file.

pull_request:
branches: [main]
workflow_dispatch:
```

- **Push to `main`**: Full build, test, deploy to Cloudflare Pages staging
- **Pull Requests**: Build, test, deploy preview to Cloudflare Pages
- **Push to `copilot/**`**: CI builds for Copilot branches
- **Pull Requests to `main`**: Build, test, deploy preview to Cloudflare Pages (runs once per push)
- **Manual**: Via workflow_dispatch in GitHub Actions UI

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This line describes the behavior for "Push to copilot/**" branches, but this trigger has been removed from the workflow. This line should be deleted as it no longer applies to the updated workflow configuration.

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This was already fixed in commit 6ddd94e. The line about "Push to copilot/**" has been removed from the documentation.


**Note**: The workflow triggers only on `pull_request` events for PR branches, not on `push` events, which prevents duplicate workflow runs when pushing commits to a PR branch.

### Jobs

#### A. `changes`
Expand Down Expand Up @@ -149,7 +150,6 @@ on:
- 'data/festivals.json'
- '.github/workflows/cloudflare-worker.yml'
pull_request:

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This line in the code example shows branches: [main] under the pull_request trigger, but this has been removed from the actual cloudflare-worker.yml workflow file. The documentation should match the actual workflow configuration and omit this line.

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This was already fixed in commit 6ddd94e. The branches: [main] line under pull_request has been removed from the documentation to match the actual workflow file.

branches: [main]
paths:
- 'cloudflare-worker/**'
- 'data/festivals.json'
Expand All @@ -158,9 +158,11 @@ on:
```

- **Push to `main`**: Deploy worker if worker or festivals.json changed
- **Pull Requests**: Validate worker (dry-run) if worker or festivals.json changed
- **Pull Requests**: Validate worker (dry-run) if worker or festivals.json changed (runs once per push)
- **Manual**: Via workflow_dispatch in GitHub Actions UI

**Note**: The `pull_request` trigger doesn't specify branches, allowing PRs from any branch while still running only once per push.

### Jobs

#### A. `changes`
Expand Down Expand Up @@ -677,6 +679,55 @@ gh run rerun <run-id>

---

## Avoiding Duplicate CI Runs

### Problem

When a workflow is configured with both `push` and `pull_request` triggers for the same branches, it can run twice for the same commit:

```yaml
# ❌ BAD: Causes duplicate runs on PR pushes
on:
push:
branches: [main, feature/**]
pull_request:
branches: [main]
```

**Result**: Push to a PR branch → workflow runs on `push` event **AND** on `pull_request` event = **2 runs** 💰💸

### Solution

Our workflows are configured to run **only once** per commit:

```yaml
# ✅ GOOD: Runs only once per PR push
on:
push:
branches: [main] # Only run on direct pushes to main
pull_request:
branches: [main] # Run on all PRs targeting main
```

**Result**:
- Push to a PR branch → workflow runs **only** on `pull_request` event = **1 run** ✅
- Push directly to main → workflow runs **only** on `push` event = **1 run** ✅

### Benefits

1. **Cost savings** - Reduces GitHub Actions minutes usage by 50%
2. **Faster feedback** - No waiting for duplicate runs to complete
3. **Cleaner UI** - Fewer runs to monitor in the Actions tab
4. **Resource efficiency** - Less CI queue contention

### Additional Notes

- The `pull_request` trigger in some workflows (e.g., `cloudflare-worker.yml`) doesn't specify `branches`, which allows PRs from any branch while still maintaining single-run behavior
- The `workflow_dispatch` trigger allows manual runs when needed
- Concurrency groups ensure that new pushes to the same branch cancel in-progress runs (except on `main`)

---

## Summary

The Cambridge Beer Festival app uses **3 specialized workflows**:
Expand All @@ -690,3 +741,4 @@ This separation provides:
- **Independent triggers** - Worker can deploy without rebuilding app
- **Optimized execution** - Only relevant jobs run for each change
- **Better monitoring** - Easier to track specific deployment types
- **Single run per commit** - Avoids duplicate CI runs on PR pushes
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