Use buildx for docker-compose-generator

docker-compose-generator/Dockerfile

@@ -0,0 +1,22 @@
+#
+FROM --platform=$BUILDPLATFORM mcr.microsoft.com/dotnet/sdk:8.0.101-bookworm-slim AS builder
+WORKDIR /source
+COPY src/docker-compose-generator.csproj docker-compose-generator.csproj
+# Cache some dependencies
+RUN dotnet restore
+COPY src/. .
+RUN dotnet publish --output /app/ --configuration Release
+
+#
+FROM mcr.microsoft.com/dotnet/runtime:8.0.1-bookworm-slim
+LABEL org.btcpayserver.image=docker-compose-generator
+WORKDIR /datadir
+WORKDIR /app
+ENV APP_DATADIR=/datadir
+VOLUME /datadir
+
+ENV INSIDE_CONTAINER=1
+
+COPY --from=builder "/app" .
+
+ENTRYPOINT ["dotnet", "docker-compose-generator.dll"]