Added csproj to Dockerfile

Dockerfile

@@ -8,13 +8,13 @@ ARG BUILDPLATFORM
 
 WORKDIR /src
 COPY *.csproj .
-RUN dotnet restore -r
+RUN dotnet restore "MauMau-Server.csproj"
 COPY . .
 WORKDIR "/src"
-RUN dotnet build -c Release -o /app/build -a $TARGETARCH
+RUN dotnet build "MauMau-Server.csproj" -c Release -o /app/build -a $TARGETARCH
 
 FROM build AS publish
-RUN dotnet public -c Release -o /app/publish \
+RUN dotnet public "MauMau-Server.csproj" -c Release -o /app/publish \
     --self-contained true \
     /p:PublishTrimmed=true \
     /p:PublishSingleFile=true \