feat: complete OCI registry implementation with docker push/pull support

A lightweight OCI (Open Container Initiative) registry implementation written in Go.

internal/opt/opt.go

@@ -0,0 +1,20 @@
+package opt
+
+import (
+	"context"
+	"os"
+)
+
+var (
+	GlobalDebug   bool
+	GlobalAddress string
+	GlobalDataDir string
+)
+
+func Init(ctx context.Context) error {
+	if err := os.MkdirAll(GlobalDataDir, 0755); err != nil {
+		return err
+	}
+
+	return nil
+}