Build updates

Weather/SerialReader/Dockerfile

@@ -0,0 +1,15 @@
+FROM mcr.microsoft.com/dotnet/core/aspnet:3.0.0-preview6-buster-slim-arm32v7 AS base
+WORKDIR /app
+
+FROM mcr.microsoft.com/dotnet/core/sdk:3.0.100-preview6-buster AS build
+WORKDIR /src
+COPY ["./SerialReader.csproj", "./"]
+RUN dotnet restore -r linux-arm "SerialReader.csproj"
+COPY . .
+WORKDIR "/src/"
+RUN dotnet publish -r linux-arm --self-contained=false "SerialReader.csproj" -c Release -o /app
+
+FROM base AS final
+WORKDIR /app
+COPY --from=build /app .
+ENTRYPOINT ["dotnet", "ChrisKaczor.HomeMonitor.Weather.SerialReader.dll"]