Docker and ARM64 - could not load file or assembly

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Linux

My net core 5 API project builds and runs perfectly on an ARM64 SBC running Armbian. But when I try to run it in a Docker container it builds fine but gives an error when I try to run it 'Could not load file or assembly ‘/MyAPI.dll’. The system cannot find the file specified. I think it must be path related but can't see anything obviously wrong with the Dockerfile

What I have tried:

Building using this Dockerfile ( From Microsoft )

# Get Base Image (Full .NET Core SDK)
FROM mcr.microsoft.com/dotnet/sdk AS build-env
WORKDIR /app

# Copy csproj and restore
COPY *.csproj ./
RUN dotnet restore

# Copy everything else and build
COPY . ./
RUN dotnet publish -c Release -o out

# Generate runtime image
FROM mcr.microsoft.com/dotnet/aspnet
COPY --from=build-env /app/out/ .
ENTRYPOINT ["dotnet", "MyAPI.dll"]