Hi,

I am trying to build a .net API using .net 7 on this platform. I have a working Dockerfile in my local directory that I can verify is building and working when testing. But every time I try and deploy to Railway I am greeted with the same error :

2.440 MSBUILD : error MSB1003: Specify a project or solution file. The current working directory does not contain a project or solution file.

This to me is confusing, as I have made sure that I am including the api.csproj and api.slmslnin source control.

I have googled and googled and stackoverflowed until giving up I could not find a solution, so I am reaching out to try and get some guidance as to what is happening. Just to reiterate - this Dockerfile is building normally on my local machine. Is there something glaringly obvious as to why I am not able to build .net from a dockerfile on this platform?

My complete dockerfile is something like this:

Build Stage

FROM mcr.microsoft.com/dotnet/sdk:7.0 AS build

WORKDIR /source

COPY . .

RUN dotnet restore "src/api/api.csproj" --disable-parallel
RUN dotnet publish "src/api/api.csproj" -c Release -o /app --no-restore

Serve Stage

FROM mcr.microsoft.com/dotnet/aspnet:7.0 AS runtime

WORKDIR /app

Copy from /app directory into build directory to serve

COPY --from=build /app ./

EXPOSE 80

ENTRYPOINT ["dotnet", "api.dll"]

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