Refactor CLI to use flags instead of positional arguments

- Change all commands to use flags (--bucket, --prefix, etc.)
- Add --config flag to backup command
- Support VAULTIK_CONFIG environment variable for config path
- Use /etc/vaultik/config.yml as default config location
- Add test/config.yaml for testing
- Update tests to use environment variable for config path
- Add .gitignore for build artifacts and local configs
- Update documentation to reflect new CLI syntax

internal/config/config_test.go

@@ -6,24 +6,23 @@ import (
 	"testing"
 )
 
+func TestMain(m *testing.M) {
+	// Set up test environment
+	testConfigPath := filepath.Join("..", "..", "test", "config.yaml")
+	if absPath, err := filepath.Abs(testConfigPath); err == nil {
+		_ = os.Setenv("VAULTIK_CONFIG", absPath)
+	}
+	
+	code := m.Run()
+	os.Exit(code)
+}
+
 // TestConfigLoad ensures the config package can be imported and basic functionality works
 func TestConfigLoad(t *testing.T) {
-	// Create a temporary config file
-	tmpDir := t.TempDir()
-	configPath := filepath.Join(tmpDir, "test-config.yaml")
-	
-	configContent := `age_recipient: age1xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
-source_dirs:
-  - /tmp/test
-s3:
-  endpoint: https://s3.example.com
-  bucket: test-bucket
-  access_key_id: test-key
-  secret_access_key: test-secret
-`
-	
-	if err := os.WriteFile(configPath, []byte(configContent), 0644); err != nil {
-		t.Fatalf("Failed to write test config: %v", err)
+	// Use the test config file
+	configPath := os.Getenv("VAULTIK_CONFIG")
+	if configPath == "" {
+		t.Fatal("VAULTIK_CONFIG environment variable not set")
 	}
 	
 	// Test loading the config
@@ -37,11 +36,32 @@ s3:
 		t.Errorf("Expected age recipient to be set, got '%s'", cfg.AgeRecipient)
 	}
 	
-	if len(cfg.SourceDirs) != 1 || cfg.SourceDirs[0] != "/tmp/test" {
-		t.Errorf("Expected source dirs to be ['/tmp/test'], got %v", cfg.SourceDirs)
+	if len(cfg.SourceDirs) != 2 {
+		t.Errorf("Expected 2 source dirs, got %d", len(cfg.SourceDirs))
 	}
 	
-	if cfg.S3.Bucket != "test-bucket" {
-		t.Errorf("Expected S3 bucket to be 'test-bucket', got '%s'", cfg.S3.Bucket)
+	if cfg.SourceDirs[0] != "/tmp/vaultik-test-source" {
+		t.Errorf("Expected first source dir to be '/tmp/vaultik-test-source', got '%s'", cfg.SourceDirs[0])
+	}
+	
+	if cfg.S3.Bucket != "vaultik-test-bucket" {
+		t.Errorf("Expected S3 bucket to be 'vaultik-test-bucket', got '%s'", cfg.S3.Bucket)
+	}
+	
+	if cfg.Hostname != "test-host" {
+		t.Errorf("Expected hostname to be 'test-host', got '%s'", cfg.Hostname)
+	}
+}
+
+// TestConfigFromEnv tests loading config path from environment variable
+func TestConfigFromEnv(t *testing.T) {
+	configPath := os.Getenv("VAULTIK_CONFIG")
+	if configPath == "" {
+		t.Skip("VAULTIK_CONFIG not set")
+	}
+	
+	// Verify the file exists
+	if _, err := os.Stat(configPath); os.IsNotExist(err) {
+		t.Errorf("Config file does not exist at path from VAULTIK_CONFIG: %s", configPath)
 	}
 }