BULL-3221: express mvp

• added unit tests, note that the dataLayer unit tests are also overwritten when dataLayer is replaced by a real implementation
• added production dockerfile

src/controller/controller.js

@@ -34,7 +34,7 @@ exports.getUser = async (req, res) => {
     try {
         const header = req.headersDistinct?.Authorization?.[0] || req.headersDistinct?.authorization?.[0];
         const responseData = header ? jwtDecode(header) : { result: "no authorization header found" };
-        res.json(responseData);
+        res.status(200).json(responseData);
     } catch (error) {
         const errorResponse = {
             error: 'Unable to read authorization header as jwt! Error: ' + error.message
@@ -52,5 +52,5 @@ exports.getVersion = async (req, res) => {
         apiVersion: apiVersion,
         dbVersion: dbVersion
     };
-    res.json(versionResponse);
+    res.status(200).json(versionResponse);
 };