Updated docker files for devcontainers and backend build

backend/Dockerfile

@@ -0,0 +1,26 @@
+FROM mcr.microsoft.com/dotnet/sdk:8.0 as build
+
+WORKDIR /app
+
+COPY ./MuiCharts.sln ./
+COPY ./MuiCharts.Domain/*.csproj MuiCharts.Domain/
+COPY ./MuiCharts.Contracts/*.csproj MuiCharts.Contracts/
+COPY ./MuiCharts.Infrastructure/*.csproj MuiCharts.Infrastructure/
+COPY ./MuiCharts.Api/*.csproj MuiCharts.Api/
+
+RUN dotnet restore
+
+COPY . ./
+
+RUN dotnet publish --configuration Release -o out MuiCharts.Api/MuiCharts.Api.csproj
+
+FROM mcr.microsoft.com/dotnet/aspnet:8.0 as runtime
+
+WORKDIR /app
+
+COPY --from=build /app/out ./
+
+ENV HTTP_PORTS=80
+EXPOSE 80
+
+ENTRYPOINT ["dotnet", "MuiCharts.Api.dll"]