Add dummy backend (#3820)

Co-authored-by: Anbraten <6918444+anbraten@users.noreply.github.com>

.vscode/settings.json

@@ -9,6 +9,9 @@
   "go.lintTool": "golangci-lint",
   "go.lintFlags": ["--fast"],
   "go.buildTags": "test",
+  "gopls": { // cspell:words gopls
+    "buildFlags": ["-tags=test"]
+  },
   "eslint.workingDirectories": ["./web"],
   "prettier.ignorePath": "./web/.prettierignore",
   // Enable the ESlint flat config support