feat(01-01): add compose validation script (validate-compose.sh)

- Validates docker-compose.yml syntax using 'docker compose config'
- Shows usage when called without arguments
- Handles missing files gracefully with clear error messages
- Supports -h/--help flag
- Color-coded output (green success, red error)
- Exit code 0 on valid config, 1 on errors

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

scripts/validate-compose.sh

@@ -0,0 +1,94 @@
+#!/bin/bash
+# Laboratori Cloud - Docker Compose Validation Script
+# Part of: "Corso Soluzioni Cloud"
+#
+# Description: Validates docker-compose.yml syntax using 'docker compose config'
+# Usage: ./scripts/validate-compose.sh [path-to-compose-file]
+
+# Color codes for output
+RED='\033[0;31m'
+GREEN='\033[0;32m'
+YELLOW='\033[1;33m'
+NC='\033[0m' # No Color
+
+# Function to print error message
+print_error() {
+    echo -e "${RED}[ERROR]${NC} $1" >&2
+}
+
+# Function to print success message
+print_success() {
+    echo -e "${GREEN}[SUCCESS]${NC} $1"
+}
+
+# Function to print info message
+print_info() {
+    echo "[INFO] $1"
+}
+
+# Function to print usage
+print_usage() {
+    cat << EOF
+Usage: $0 [path-to-compose-file]
+
+Validates a docker-compose.yml file using 'docker compose config' without deploying.
+
+Arguments:
+  path-to-compose-file    Path to the docker-compose.yml file to validate
+
+Options:
+  -h, --help              Show this help message
+
+Examples:
+  $0 docker-compose.yml
+  $0 labs/01-iam/docker-compose.yml
+
+Exit codes:
+  0 - Validation successful
+  1 - Validation failed or file not found
+EOF
+}
+
+# Check for help flag
+if [ "$1" = "-h" ] || [ "$1" = "--help" ]; then
+    print_usage
+    exit 0
+fi
+
+# Check if argument is provided
+if [ -z "$1" ]; then
+    print_error "No compose file specified"
+    echo ""
+    print_usage
+    exit 1
+fi
+
+COMPOSE_FILE="$1"
+
+# Check if file exists
+if [ ! -f "$COMPOSE_FILE" ]; then
+    print_error "File not found: $COMPOSE_FILE"
+    exit 1
+fi
+
+print_info "Validating compose file: $COMPOSE_FILE"
+
+# Get the directory of the compose file
+COMPOSE_DIR=$(dirname "$COMPOSE_FILE")
+
+# Try to validate using docker compose config
+# We redirect stderr to stdout to capture error messages
+VALIDATION_OUTPUT=$(cd "$COMPOSE_DIR" && docker compose -f "$(basename "$COMPOSE_FILE")" config 2>&1)
+VALIDATION_EXIT=$?
+
+if [ $VALIDATION_EXIT -eq 0 ]; then
+    print_success "Compose file validation passed"
+    print_info "YAML syntax is valid and all directives are recognized"
+    exit 0
+else
+    print_error "Compose file validation failed"
+    echo ""
+    echo "Docker Compose output:"
+    echo "$VALIDATION_OUTPUT"
+    exit 1
+fi