github-actions-2025

# GitHub Actions 2025 Features

## 1 vCPU Linux Runners (October 2025 - Public Preview)

**What:** New lightweight runners optimized for automation tasks with lower cost.

**Specs:**
- 1 vCPU
- 5 GB RAM
- 15-minute job limit
- Optimized for short-running tasks

### When to Use 1 vCPU Runners

**Ideal for:**
- Issue triage automation
- Label management
- PR comment automation
- Status checks
- Lightweight scripts
- Git operations (checkout, tag, commit)
- Notification tasks

**NOT suitable for:**
- Build operations
- Test suites
- Complex CI/CD pipelines
- Resource-intensive operations

### Usage

```yaml
# .github/workflows/automation.yml
name: Lightweight Automation

on:
  issues:
    types: [opened, labeled]

jobs:
  triage:
    runs-on: ubuntu-latest-1-core  # New 1 vCPU runner
    timeout-minutes: 10  # Max 15 minutes
    steps:
      - name: Triage Issue
        run: |
          echo "Triaging issue..."
          gh issue edit ${{ github.event.issue.number }} --add-label "needs-review"
```

### Cost Savings Example

```yaml
# Before: Using 2 vCPU runner for simple task
jobs:
  label:
    runs-on: ubuntu-latest  # 2 vCPU, higher cost
    steps:
      - name: Add label
        run: gh pr edit ${{ github.event.number }} --add-label "reviewed"

# After: Using 1 vCPU runner (lower cost)
jobs:
  label:
    runs-on: ubuntu-latest-1-core  # 1 vCPU, 50% cost reduction
    timeout-minutes: 5
    steps:
      - name: Add label
        run: gh pr edit ${{ github.event.number }} --add-label "reviewed"
```

## Immutable Releases (August 2025)

**What:** Releases can now be marked immutable - assets and Git tags cannot be changed or deleted once released.

**Benefits:**
- Supply chain security
- Audit compliance
- Prevent tampering
- Trust in release artifacts

### Create Immutable Release

```bash
# Using GitHub CLI
gh release create v1.0.0 \
  dist/*.zip \
  --title "Version 1.0.0" \
  --notes-file CHANGELOG.md \
  --immutable

# Verify immutability
gh release view v1.0.0 -