feat: Allow to specify the path to the devfile with factory workflow

Fixes eclipse-che/che#20607

packages/dashboard-frontend/src/services/helpers/location.ts

@@ -48,13 +48,26 @@ export function buildFactoryLoaderLocation(url?: string): Location {
         editor = editorParam.slice();
     }
     fullUrl.searchParams.delete('che-editor');
+
+    // search for devfile switch and if there is one, remove it from the URL
+    const devfileFilenameAttribute = 'devfileFilename';
+    const devfileFilenameParam = fullUrl.searchParams.get(devfileFilenameAttribute);
+    let devfileFilename;
+    if (devfileFilenameParam && typeof(devfileFilenameParam) === 'string') {
+      devfileFilename = devfileFilenameParam.slice();
+    }
+    fullUrl.searchParams.delete(devfileFilenameAttribute);
+
     const encodedUrl = encodeURIComponent(fullUrl.toString());
 
     // if editor specified, add it as a new parameter
     pathAndQuery = ROUTE.LOAD_FACTORY_URL.replace(':url', encodedUrl);
     if (editor) {
       pathAndQuery = `${pathAndQuery}&che-editor=${editor}`;
     }
+    if (devfileFilename) {
+      pathAndQuery = `${pathAndQuery}&override.devfileFilename=${devfileFilename}`;
+    }
   }
   return _buildLocationObject(pathAndQuery);
 }