feat: open mobile dashboard offline (#226)

src/views.py

@@ -9,7 +9,14 @@ MANIFEST_FILE = DASHBOARD_FILE.parent / "manifest.webmanifest"
 SERVICE_WORKER_FILE = DASHBOARD_FILE.parent / "service-worker.js"
 
 
-@router.get("/", response_class=HTMLResponse)
+class RevalidatingHTMLResponse(HTMLResponse):
+    def __init__(self, content, status_code=200, headers=None, media_type=None, background=None):
+        response_headers = dict(headers or {})
+        response_headers["Cache-Control"] = "no-cache"
+        super().__init__(content, status_code, response_headers, media_type, background)
+
+
+@router.get("/", response_class=RevalidatingHTMLResponse)
 async def dashboard() -> str:
     return DASHBOARD_FILE.read_text()