dotenvage 0.1.2

# Automated Dependency Management - Summary

## 🎯 What You Asked For

> "Configure dependabot and/or our GHA workflows to have dependency
> updates done fully automatically, ideally batched up once per night
> or once per week, and then have them all merged into main, causing a
> patch version bump and a publish on crates.io, so that our latest
> version is always up to date."

## ✅ What I've Configured

### 1. **Grouped Weekly Dependency Updates**

- **Schedule:** Every Monday at 2:00 AM UTC
- **Behavior:** All patch and minor updates batched into a single PR
- **File:** `.github/dependabot.yml`

### 2. **Automatic PR Approval & Merge**

- **Patch/Minor Updates:** Automatically approved and merged after CI
  passes
- **Major Updates:** Flagged for manual review (NOT auto-merged)
- **File:** `.github/workflows/dependabot-auto-merge.yml`

### 3. **Automatic Version Bump & Publish**

- **Trigger:** When dependency updates are merged to main
- **Tool:** Uses Cocogitto (`cog bump --patch`)
- **Actions:**
  1. Bumps patch version in Cargo.toml
  2. Creates conventional commit automatically
  3. Creates git tag (e.g., v0.1.3)
  4. Generates GitHub Release
  5. Publishes to crates.io
- **File:** `.github/workflows/auto-version-bump.yml`

## 📋 What You Need to Do

### ✅ Already Completed:

1. **Auto-Merge** - Enabled via `gh repo edit --enable-auto-merge`
2. **GitHub Actions Permissions** - Configured with write permissions
   and PR approval
3. **crates.io Token** - Already configured as `CRATES_IO_TOKEN`

### 🚀 Remaining Steps (2 minutes):

**Just commit and push** the new configuration files:

```bash
git add .github/
git commit -m "feat(ci): add automated dependency management"
git push
```

## 🔄 How It Works (The Full Cycle)

```text
Monday 2 AM UTC
       ↓
Dependabot scans for updates
       ↓
Creates grouped PR with all patch/minor updates
       ↓
CI workflow runs (Format, Clippy, Tests)
       ↓
Auto-merge workflow approves PR
       ↓
PR merges automatically (after CI passes)
       ↓
Version bump workflow triggers
       ↓
Patch version bumped (e.g., 0.1.2 → 0.1.3)
       ↓
Git tag created (v0.1.3)
       ↓
GitHub Release created
       ↓
Published to crates.io
       ↓
✅ Your crate is now up-to-date!
```

## 📁 Files Created/Modified

### Modified:

- `.github/dependabot.yml` - Enhanced with grouping, scheduling, and
  labels

### Created:

- `.github/workflows/dependabot-auto-merge.yml` - Auto-approval and
  merge logic
- `.github/workflows/auto-version-bump.yml` - Version bumping and
  publishing
- `.github/DEPENDABOT_AUTOMATION.md` - Detailed documentation
- `.github/SETUP_CHECKLIST.md` - Step-by-step setup guide
- `AUTOMATION_SUMMARY.md` (this file) - Overview and summary

## 🔒 Safety Features

- ✅ Only patch and minor updates auto-merge
- ✅ Major updates require manual review
- ✅ All updates must pass CI before merging
- ✅ Branch protection compatible (optional)
- ✅ Follows semantic versioning
- ✅ Conventional commit messages

## 🎯 Key Design Decisions

### ✅ Linear History (Rebase-Only)

- **Auto-merge uses `--rebase`** to maintain linear history
- No merge commits created by automation
- Clean, easy-to-follow git history
- Compatible with `git bisect` and history analysis

### ✅ Conventional Commits Throughout

- **Dependabot PRs:** Prefixed with `build(deps):` (configured in
  `dependabot.yml`)
- **Version bump commits:** Created by Cocogitto with `chore(bump):`
  prefix
- **All automation follows:** Conventional Commits standard
- Enables automatic changelog generation

### ✅ Cocogitto for Version Management

- Uses `cog bump --patch` instead of manual git tagging
- Automatically creates conventional commit for version bump
- Tags are created consistently
- Integrates with existing `cog.toml` configuration
- Future-proof for changelog automation

### ✅ Single Token Architecture

- Uses existing `CRATES_IO_TOKEN` (not a new token)
- Dependabot uses `GITHUB_TOKEN` (automatic, no setup needed)
- No separate token for Dependabot required
- Simple and secure token management

## 📊 Expected Results

After setup, you'll see:

- **Weekly:** 1 Dependabot PR every Monday (grouped)
- **Automatic:** PR approved and merged (if CI passes)
- **Automatic:** Version bumped and published to crates.io
- **Result:** Always-updated dependencies without manual intervention

## 🎛️ Customization Options

### Change Schedule (daily/weekly/monthly)

Edit `.github/dependabot.yml`:

```yaml
schedule:
  interval: "daily" # or "weekly" or "monthly"
```

### Change Day/Time

```yaml
schedule:
  interval: "weekly"
  day: "friday" # any day of the week
  time: "14:00" # 24-hour UTC time
```

### Disable Auto-Publish

Comment out the "Publish to crates.io" step in `auto-version-bump.yml`

### Separate Dependency Groups

Instead of grouping all updates, you can separate by type:

```yaml
groups:
  production-dependencies:
    dependency-type: "production"
  development-dependencies:
    dependency-type: "development"
```

## 🧪 Testing Before Going Live

### Test Dependabot Grouping

Wait for next Monday, or manually trigger by closing/reopening the
current Dependabot PR.

### Test Auto-Merge

Create a test PR and verify the workflow runs:

```bash
gh pr checks <PR-NUMBER>
```

### Test Version Bump (Dry Run)

You can manually test the version bump locally:

```bash
cargo install cargo-edit
cargo set-version --bump patch
git diff Cargo.toml
git checkout Cargo.toml  # undo changes
```

## 📚 Documentation

- **Detailed Guide:** `.github/DEPENDABOT_AUTOMATION.md`
- **Setup Steps:** `.github/SETUP_CHECKLIST.md`
- **This Summary:** `AUTOMATION_SUMMARY.md`

## 🆘 Troubleshooting

See `.github/DEPENDABOT_AUTOMATION.md` for common issues and
solutions.

Quick checks:

```bash
# Verify configuration
cat .github/dependabot.yml

# Check recent workflow runs
gh run list --limit 10

# Check Dependabot PRs
gh pr list --label dependencies

# Verify secrets
gh secret list
```

## 🎓 Key Learnings from Research

Based on latest (2025/2026) best practices:

1. **Dependabot now supports grouped updates** (July 2025 feature)
2. **Cron expressions for scheduling** (April 2025 feature)
3. **Trusted Publishing for crates.io** (July 2025 feature -
   recommended but not required)
4. **pull_request_target** event is safer than pull_request for bot
   workflows
5. **cargo-edit** is the standard tool for version management

## 🚀 Next Steps

1. ✅ Review the configuration files
2. ✅ Complete the setup checklist
3. ✅ Test with first Dependabot run
4. ✅ Monitor and adjust as needed
5. ✅ Apply to other repositories!

## ❓ Questions or Issues?

Refer to:

- `.github/DEPENDABOT_AUTOMATION.md` - Full documentation
- `.github/SETUP_CHECKLIST.md` - Setup instructions
- [GitHub Dependabot Docs](https://docs.github.com/code-security/dependabot)
- [Automating Dependabot Guide](https://docs.github.com/code-security/supply-chain-security/keeping-your-dependencies-updated-automatically/automating-dependabot-with-github-actions)

---

**Status:** ✅ Configuration Complete - Ready for Setup

**Next Action:** Follow `.github/SETUP_CHECKLIST.md` to enable
automation