🤖 feat: implement trunk-based CI/CD with local testing

- Designed trunk-based development workflow with branch protection
- Added workflow validation job to prevent main branch breaks
- Integrated act (GitHub Actions runner) for local Gitea workflow testing
- Created unified CI/CD script interface (scripts/cicd.sh)
- Added YAML lint configuration with practical limits (400 chars)
- Organized all CI/CD scripts under scripts/cicd/ directory
- Confirmed Gitea/GitHub Actions compatibility via local testing
- Updated ADR 0017 with implementation details and test results
- Enhanced documentation with local development workflow

See ADR-0017 for complete trunk-based development workflow documentation.
See ADR-0016 for CI/CD pipeline design.

scripts/cicd.sh

@@ -0,0 +1,76 @@
+#!/bin/bash
+# DanceLessonsCoach CI/CD Management Script
+# Unified interface for all CI/CD operations
+
+set -e
+
+SCRIPTS_DIR="$(dirname "$0")/cicd"
+
+echo "🚀 DanceLessonsCoach CI/CD Management"
+echo "===================================="
+echo ""
+
+if [ $# -eq 0 ]; then
+    echo "Available commands:"
+    echo "  validate       - Validate CI/CD workflow structure"
+    echo "  test-simple    - Test workflow locally without Gitea"
+    echo "  test-local    - Test local setup with Gitea configuration"
+    echo "  test-docker   - Test with docker compose (requires Gitea runner)"
+    echo "  check-status   - Check pipeline status on Gitea"
+    echo "  help          - Show this help message"
+    echo ""
+    echo "Usage: $0 <command>"
+    exit 1
+fi
+
+COMMAND="$1"
+shift
+
+case "$COMMAND" in
+    validate)
+        echo "🔍 Validating CI/CD workflow..."
+        "$SCRIPTS_DIR/validate-workflow.sh"
+        ;;
+    
+    test-simple)
+        echo "🧪 Running simple CI/CD test (no Gitea required)..."
+        "$SCRIPTS_DIR/test-cicd-simple.sh"
+        ;;
+    
+    test-local)
+        echo "🧪 Testing local CI/CD setup..."
+        "$SCRIPTS_DIR/test-cicd-local.sh"
+        ;;
+    
+    test-docker)
+        echo "🐳 Testing with docker compose..."
+        "$SCRIPTS_DIR/test-cicd-docker.sh"
+        ;;
+    
+    test-act)
+        echo "🎭 Testing Gitea workflows with GitHub Actions runner..."
+        "$SCRIPTS_DIR/test-act-local.sh"
+        ;;
+    
+    check-status)
+        echo "🔍 Checking pipeline status..."
+        "$SCRIPTS_DIR/check-pipeline-status.sh"
+        ;;
+    
+    help|--help|-h)
+        echo "Available commands:"
+        echo "  validate       - Validate CI/CD workflow structure"
+        echo "  test-simple    - Test workflow locally without Gitea"
+        echo "  test-local    - Test local setup with Gitea configuration"
+        echo "  test-docker   - Test with docker compose (requires Gitea runner)"
+        echo "  test-act      - Test Gitea workflows with GitHub Actions runner"
+        echo "  check-status   - Check pipeline status on Gitea"
+        echo "  help          - Show this help message"
+        ;;
+    
+    *)
+        echo "❌ Unknown command: $COMMAND"
+        echo "Run '$0 help' for available commands"
+        exit 1
+        ;;
+esac