Update Dockerfile

reactions/gremlin/gremlin-reaction/Dockerfile

@@ -15,14 +15,14 @@
 
 #See https://aka.ms/containerfastmode to understand how Visual Studio uses this Dockerfile to build your images for faster debugging.
 
-FROM mcr.microsoft.com/dotnet/sdk:8.0-cbl-mariner2.0 AS build
+FROM --platform=$BUILDPLATFORM mcr.microsoft.com/dotnet/sdk:8.0-cbl-mariner2.0 AS build
 ARG BUILD_CONFIGURATION=Release
 WORKDIR /src
 COPY . . 
 RUN dotnet restore
 RUN dotnet build -c $BUILD_CONFIGURATION -o /app/build
 
-FROM mcr.microsoft.com/dotnet/aspnet:8.0-cbl-mariner2.0 AS final
+FROM --platform=$BUILDPLATFORM mcr.microsoft.com/dotnet/aspnet:8.0-cbl-mariner2.0 AS final
 WORKDIR /app
 COPY --from=build /app/build .
-ENTRYPOINT ["/app/gremlin-reaction"]
+ENTRYPOINT ["/app/gremlin-reaction"]