fix: update dockerfile

nethermind/Dockerfile

@@ -12,7 +12,7 @@ RUN git clone $REPO --branch op-node/$VERSION --single-branch . && \
 RUN cd op-node && \
     make VERSION=$VERSION op-node
 
-FROM mcr.microsoft.com/dotnet/sdk:8.0-noble AS build
+FROM --platform=$BUILDPLATFORM mcr.microsoft.com/dotnet/sdk:8.0-noble AS build
 
 ARG BUILD_CONFIG=release
 ARG TARGETARCH
@@ -25,12 +25,13 @@ ENV COMMIT=7320938e5fe74ad6ac1782ce723ddb7bb7d3d78a
 RUN git clone $REPO --branch release/$VERSION --single-branch . && \
     git switch -c branch-$VERSION 
 RUN bash -c '[ "$(git rev-parse HEAD)" = "$COMMIT" ]'
+RUN TARGETARCH=${TARGETARCH#linux/} && \
+    arch=$([ "$TARGETARCH" = "amd64" ] && echo "x64" || echo "$TARGETARCH") && \
+    echo "Using architecture: $arch" && \
+    dotnet publish src/Nethermind/Nethermind.Runner -c $BUILD_CONFIG -a $arch -o /publish --sc false
 
-RUN arch=$([ "$TARGETARCH" = "amd64" ] && echo "x64" || echo "$TARGETARCH") && \
-    dotnet publish src/Nethermind/Nethermind.Runner -c $BUILD_CONFIG -a $arch -o /publish --sc false 
 
-
-FROM mcr.microsoft.com/dotnet/aspnet:8.0-noble
+FROM --platform=$BUILDPLATFORM mcr.microsoft.com/dotnet/aspnet:8.0-noble
 
 RUN apt-get update && \
     apt-get install -y jq curl supervisor && \