Add comprehensive skills and documentation for various technologies

.claude/skills/devops/github-actions/SKILL.md

@@ -0,0 +1,88 @@
+# GitHub Actions
+
+## Description
+
+GitHub Actions CI/CD workflows including testing, building, and deployment.
+
+## When to Use
+
+- Setting up CI/CD pipelines
+- Automating tests and builds
+- Deployment automation
+
+---
+
+## Core Patterns
+
+### Basic CI Workflow
+
+```yaml
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+          cache: 'npm'
+      - run: npm ci
+      - run: npm test
+```
+
+### Matrix Builds
+
+```yaml
+jobs:
+  test:
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest]
+        node: [18, 20]
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/setup-node@v4
+        with:
+          node-version: ${{ matrix.node }}
+```
+
+### Caching
+
+```yaml
+- uses: actions/cache@v4
+  with:
+    path: ~/.npm
+    key: npm-${{ hashFiles('**/package-lock.json') }}
+    restore-keys: npm-
+```
+
+### Secrets
+
+```yaml
+- name: Deploy
+  env:
+    API_KEY: ${{ secrets.API_KEY }}
+  run: deploy --key "$API_KEY"
+```
+
+## Best Practices
+
+1. Use caching for dependencies
+2. Run jobs in parallel when possible
+3. Use environment secrets
+4. Pin action versions
+5. Add proper triggers
+
+## Common Pitfalls
+
+- **Slow pipelines**: Add caching
+- **Secret exposure**: Never echo secrets
+- **Unpinned versions**: Use @v4 not @main