Add env var to specify yt-dlp code branch.

Dockerfile

@@ -10,5 +10,5 @@ WORKDIR /app
 COPY --from=build /app .
 RUN apt-get update -y
 RUN apt-get install -y python3-pip git aspnetcore-runtime-6.0
-RUN python3 -m pip install --upgrade git+https://github.com/yt-dlp/yt-dlp.git@release
+RUN python3 -m pip install --force-reinstall git+https://github.com/yt-dlp/yt-dlp.git@release
 ENTRYPOINT [ "dotnet", "TelegramVideoBot.dll" ]

README.md

@@ -13,6 +13,7 @@ Uses YT-DLP and FFMpeg under the hood. Supports hardware acceleration, but it wi
 - `TG_BOT_TOKEN`: Bot token obtained from Botfather. Required.
 - `TG_BOT_NAME`: Name used in `/help` and `/start` command text. Optional, defaults to `Frozen's Video Bot`.
 - `UPDATE_YTDLP_ON_START`: Update the local installation of YT-DLP on start. Optional, defaults to false. Highly recommended in container deployments.
+- `YTDLP_UPDATE_BRANCH`: The code branch to use when YT-DLP updates on start (if `UPDATE_YTDLP_ON_START` is true). Optional, defaults to `release`. 
 - `DOWNLOAD_QUEUE_LIMIT`: Number of videos allowed in each user's download queue. Optional, defaults to 5.
 - `TZ`: Timezone. Optional, defaults to UTC.
 

Utilities/EnvironmentConfig.cs

@@ -6,4 +6,5 @@ public class EnvironmentConfig
     public string TelegramBotName => Environment.GetEnvironmentVariable("TG_BOT_NAME") ?? string.Empty;
     public bool UpdateYtDlpOnStart => bool.Parse(Environment.GetEnvironmentVariable("UPDATE_YTDLP_ON_START") ?? "false");
     public int DownloadQueueLimit => int.Parse(Environment.GetEnvironmentVariable("DOWNLOAD_QUEUE_LIMIT") ?? "5");
+    public string YtDlpUpdateBranch => Environment.GetEnvironmentVariable("YTDLP_UPDATE_BRANCH") ?? "release";
 }

Workers/YtDlp.cs

@@ -11,7 +11,7 @@ public YtDlp(EnvironmentConfig config, ILogger<YtDlp> logger)
         {
             var updateStartInfo = new ProcessStartInfo("python3")
             {
-                Arguments = "-m pip install --upgrade git+https://github.com/yt-dlp/yt-dlp.git@release",
+                Arguments = $"-m pip install --force-reinstall git+https://github.com/yt-dlp/yt-dlp.git@{config.YtDlpUpdateBranch}",
                 RedirectStandardError = true,
                 RedirectStandardOutput = true
             };