chore: refactor Dockerfile

- Rename the Dockerfile stage for VS fast mode stage debugging
- Add an argument for build configuration in the .NET build stage
- Remove unnecessary comments and lines in the Dockerfile.ubi stage
- Add libicu and tzdata packages in the base stage of the Dockerfile.ubi

Signed-off-by: 陳鈞 <[email protected]>

Dockerfile

@@ -1,5 +1,6 @@
 #See https://aka.ms/customizecontainer to learn how to customize your debug container and how Visual Studio uses this Dockerfile to build your images for faster debugging.
 
+### Base image for yt-dlp
 FROM mcr.microsoft.com/dotnet/runtime:8.0-alpine AS base
 WORKDIR /app
 RUN apk add --no-cache tzdata python3 && \
@@ -17,8 +18,11 @@ ENV TZ=Asia/Taipei
 # https://github.com/dotnet/runtime/issues/34126#issuecomment-1104981659
 ENV DOTNET_SYSTEM_IO_DISABLEFILELOCKING=true
 
+### Debug image (same as base image)
+### Rename for VS fast mode stage debugging
 FROM base AS debug
 
+### Build .NET
 FROM mcr.microsoft.com/dotnet/sdk:8.0-alpine AS build
 ARG BUILD_CONFIGURATION=Release
 WORKDIR /src
@@ -32,6 +36,7 @@ ARG BUILD_CONFIGURATION=Release
 ARG TARGETPLATFORM
 RUN dotnet publish "YoutubeLiveChatToDiscord.csproj" --no-self-contained -p:PublishTrimmed=false -c $BUILD_CONFIGURATION -o /app/publish
 
+### Final image
 FROM base AS final
 WORKDIR /app
 COPY --from=publish /app/publish .

Dockerfile.ubi

@@ -1,3 +1,5 @@
+# syntax=docker/dockerfile:1
+
 ### Python
 FROM registry.access.redhat.com/ubi9/ubi-minimal AS python
 
@@ -15,8 +17,7 @@ RUN python3.11 -m venv /venv && \
     pip3.11 install yt-dlp && \
     pip3.11 uninstall -y setuptools pip && \
     microdnf -y remove python3.11-pip && \
-    microdnf -y clean all && \
-    rm -rf /var/cache/yum/*
+    microdnf -y clean all
 
 ENV PATH="/venv/bin:$PATH"
 
@@ -26,8 +27,7 @@ FROM python AS base
 WORKDIR /app
 
 RUN microdnf -y install libicu tzdata && \
-    microdnf -y clean all && \
-    rm -rf /var/cache/yum/*
+    microdnf -y clean all
 
 ENV TZ=Asia/Taipei