Build docker-compose-generator multiarch Docker images

docker-compose-generator/Dockerfile.linuxarm32v7

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+# This is a manifest image, will pull the image with the same arch as the builder machine
+FROM microsoft/dotnet:2.1.500-sdk 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
+
+# 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 microsoft/dotnet:2.1.6-aspnetcore-runtime-stretch-slim-arm32v7
+WORKDIR /datadir
+
+WORKDIR /app
+ENV APP_DATADIR=/datadir
+VOLUME /datadir
+
+ENV INSIDE_CONTAINER=1
+
+COPY --from=builder "/app" .
+
+ENTRYPOINT ["dotnet", "docker-compose-generator.dll"]