Fixes #130 - Add catalog REST endpoint

webapp/src/main/java/com/manorrock/toyger/webapp/V2Resource.java

@@ -0,0 +1,47 @@
+package com.manorrock.toyger.webapp;
+
+import jakarta.ws.rs.GET;
+import jakarta.ws.rs.Path;
+import jakarta.ws.rs.Produces;
+import jakarta.ws.rs.core.Response;
+
+/**
+ * @author MAnfred Riem ([email protected])
+ */
+@Path("v2")
+public class V2Resource {
+
+    /**
+     * The API version check.
+     *
+     * Return status 200 with header 'Docker-Distribution-API-Version:
+     * registry/2.0'.
+     *
+     * @see
+     * https://distribution.github.io/distribution/spec/api/#api-version-check
+     * @return the response.
+     */
+    @GET
+    public Response apiVersionCheck() {
+        return Response
+                .ok()
+                .header("Docker-Distribution-API-Version", "registry/2.0")
+                .build();
+    }
+
+    /**
+     * The catalog.
+     * 
+     * @see https://distribution.github.io/distribution/spec/api/#listing-repositories
+     * @return the response.
+     */
+    @GET
+    @Path("_catalog")
+    @Produces("application/json")
+    public Response catalog() {
+        return Response
+                .ok()
+                .entity("{}")
+                .build();
+    }
+}