techdocs-cli: unified dev and production build through config detection

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>

packages/techdocs-cli/scripts/build.sh

@@ -31,11 +31,7 @@ compile_and_build_cli() {
 
 build_and_embed_app() {
   echo "🚚 Embedding app..."
-  if [ "$TECHDOCS_CLI_DEV_MODE" = "true" ] ; then
-    yarn workspace techdocs-cli-embedded-app build:dev > /dev/null
-  else
-    yarn workspace techdocs-cli-embedded-app build > /dev/null
-  fi
+  yarn workspace techdocs-cli-embedded-app build > /dev/null
   cp -r "$TECHDOCS_CLI_EMBEDDED_APP_DIR"/dist "$TECHDOCS_CLI_DIR"/dist/techdocs-preview-bundle > /dev/null
 }
 

packages/techdocs-cli/src/lib/httpServer.ts

@@ -71,10 +71,18 @@ export default class HTTPServer {
             response.setHeader('Access-Control-Allow-Methods', 'GET, OPTIONS');
 
             request.url = forwardPath;
-            return proxy.web(request, response);
+            proxy.web(request, response);
+            return;
           }
 
-          return serveHandler(request, response, {
+          // This endpoint is used by the frontend to detect where the backend is running.
+          if (request.url === '/.detect') {
+            response.setHeader('Content-Type', 'text/plain');
+            response.end('techdocs-cli-server');
+            return;
+          }
+
+          serveHandler(request, response, {
             public: this.backstageBundleDir,
             trailingSlash: true,
             rewrites: [{ source: '**', destination: 'index.html' }],