Hardcode amd64 SDK image in Dockerfile for multi platform builds

Author: MarcusWichelmann

Dockerfile

@@ -3,7 +3,8 @@ WORKDIR /app
 EXPOSE 80
 EXPOSE 443
 
-FROM mcr.microsoft.com/dotnet/sdk:5.0 AS publish
+# Use hardcoded amd64 SDK image: https://github.com/dotnet/dotnet-docker/issues/1537#issuecomment-755351628
+FROM mcr.microsoft.com/dotnet/sdk:5.0-buster-slim-amd64 AS publish
 WORKDIR /src
 COPY src/SolarEdgeExporter/SolarEdgeExporter.csproj SolarEdgeExporter/
 WORKDIR /src/SolarEdgeExporter