discover: allow customizing the device id and friendly name

This is useful if you need to run multiple servers

src/dlhdhr/app.py

@@ -108,14 +108,14 @@ async def discover_json(request: Request) -> JSONResponse:
 
     return JSONResponse(
         {
-            "FriendlyName": "dlhdhomerun",
-            "Manufacturer": "dlhdhomerun - Silicondust",
+            "FriendlyName": config.DLHD_FRIENDLY_NAME,
+            "Manufacturer": "dlhdhomerun",
             "ManufacturerURL": "https://c653labs.com/",
             "ModelNumber": "HDTC-2US",
             "FirmwareName": "hdhomeruntc_atsc",
             "TunerCount": tuners.total_available_listeners,
             "FirmwareVersion": "20170930",
-            "DeviceID": "dlhdhomerun",
+            "DeviceID": config.DLHD_DEVICE_ID,
             "DeviceAuth": "",
             "BaseURL": get_public_url(request, "/"),
             "LineupURL": get_public_url(request, "/lineup.json"),

src/dlhdhr/config.py

@@ -14,6 +14,8 @@ PORT: int = int(os.getenv("DLHDHR_PORT", 8000))
 DEBUG: bool = os.getenv("DLHDHR_DEBUG", "0").lower() in ("1", "true")
 
 DLHD_BASE_URL = os.getenv("DLHD_BASE_URL", "https://dlhd.sx/")
+DLHD_DEVICE_ID = os.getenv("DLHD_DEVICE_ID", "dlhdhr")
+DLHD_FRIENDLY_NAME = os.getenv("DLHD_FRIENDLY_NAME", "dlhdhr")
 
 CHANNEL_EXCLUDE: set[str] | None = _set_or_none("DLHDHR_CHANNEL_EXCLUDE")
 CHANNEL_ALLOW: set[str] | None = _set_or_none("DLHDHR_CHANNEL_ALLOW")