Add armv64 to the dockerfile generator

docker-compose-generator/linuxarm64v8.Dockerfile

@@ -0,0 +1,22 @@
+# This is a manifest image, will pull the image with the same arch as the builder machine
+FROM mcr.microsoft.com/dotnet/core/sdk:3.0.100-preview7 AS builder
+WORKDIR /source
+COPY src/docker-compose-generator.csproj docker-compose-generator.csproj
+# Cache some dependencies
+RUN dotnet restore /p:TargetFrameworkOverride=netcoreapp3.0
+COPY src/. .
+RUN dotnet publish --output /app/ --configuration Release /p:TargetFrameworkOverride=netcoreapp3.0
+
+# Force the builder machine to take make an arm runtime image. This is fine as long as the builder does not run any program
+FROM mcr.microsoft.com/dotnet/core/runtime:3.0.0-preview7-buster-slim-arm64v8
+WORKDIR /datadir
+
+WORKDIR /app
+ENV APP_DATADIR=/datadir
+VOLUME /datadir
+
+ENV INSIDE_CONTAINER=1
+
+COPY --from=builder "/app" .
+
+ENTRYPOINT ["dotnet", "docker-compose-generator.dll"]