Use .NET SCD (self contained deployment)

Dockerfile

@@ -1,25 +1,23 @@
-FROM debian:testing-slim as base
+FROM debian:testing-slim as builder
 
 ENV DOTNET_CLI_TELEMETRY_OPTOUT 1
 
 RUN apt-get update \
     && apt-get -y install \
+        git \
         gnupg2 \
         wget \
-        git \
     && wget -qO- https://packages.microsoft.com/keys/microsoft.asc | apt-key add - \
     && wget -qO /etc/apt/sources.list.d/microsoft.list https://packages.microsoft.com/config/debian/10/prod.list \
     && apt-get -y purge \
         gnupg2 \
         wget \
+    && apt-get update \
+    && apt-get -y install \
+        dotnet-sdk-3.0 \
     && apt-get -y autoremove --purge \
     && rm -rf /var/lib/apt/lists/*
 
-FROM base as builder
-
-RUN apt-get update \
-    && apt-get -y install dotnet-sdk-3.0
-
 ARG CACHEBUST=1
 ARG GIT_COMMIT=master
 ARG CONFIGURATION=Release
@@ -27,14 +25,13 @@ ARG CONFIGURATION=Release
 RUN git clone --depth=50 https://github.com/ppy/osu \
     && cd osu \
     && git checkout ${GIT_COMMIT} \
-    && dotnet build -c ${CONFIGURATION} osu.Desktop \
-    && dotnet publish -c ${CONFIGURATION} -r linux-x64 -o /opt/osu/ osu.Desktop
+    && dotnet publish -c ${CONFIGURATION} -r linux-x64 --self-contained true -o /opt/osu/ osu.Desktop
 
-FROM base
+FROM debian:testing-slim
 
 RUN apt-get update \
     && apt-get -y install --no-install-recommends \
-        dotnet-runtime-3.0 \
+        ca-certificates \
         ffmpeg \
         libgl1 \
         pulseaudio \
@@ -47,4 +44,4 @@ COPY --from=builder /opt/osu/ /opt/osu/
 RUN adduser --disabled-password --gecos '' osu
 USER osu
 
-ENTRYPOINT ["dotnet", "/opt/osu/osu!.dll"]
+ENTRYPOINT ["/opt/osu/osu!"]