feat: docker compose backup

internal/config/loader.go

@@ -0,0 +1,35 @@
+package config
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/spf13/viper"
+)
+
+// Load reads and validates the configuration from a YAML file.
+func Load(path string) (*Config, error) {
+	v := viper.New()
+	v.SetConfigFile(path)
+	v.SetConfigType("yaml")
+
+	// Allow env var overrides with DOCKER_BACKUP_ prefix.
+	v.SetEnvPrefix("DOCKER_BACKUP")
+	v.SetEnvKeyReplacer(strings.NewReplacer(".", "_"))
+	v.AutomaticEnv()
+
+	if err := v.ReadInConfig(); err != nil {
+		return nil, fmt.Errorf("read config %s: %w", path, err)
+	}
+
+	var cfg Config
+	if err := v.Unmarshal(&cfg); err != nil {
+		return nil, fmt.Errorf("unmarshal config: %w", err)
+	}
+
+	if err := cfg.Validate(); err != nil {
+		return nil, fmt.Errorf("validate config: %w", err)
+	}
+
+	return &cfg, nil
+}