Add docker support

GerbilManagerWebAPI/Dockerfile

@@ -0,0 +1,20 @@
+FROM mcr.microsoft.com/dotnet/aspnet:7.0 AS base
+WORKDIR /app
+EXPOSE 80
+
+ENV ASPNETCORE_URLS=http://+:80
+
+FROM --platform=$BUILDPLATFORM mcr.microsoft.com/dotnet/sdk:7.0 AS build
+ARG configuration=Release
+WORKDIR /src
+COPY ["GerbilManagerWebAPI/GerbilManagerWebAPI.csproj", "GerbilManagerWebAPI/"]
+RUN dotnet restore "GerbilManagerWebAPI/GerbilManagerWebAPI.csproj"
+COPY . .
+WORKDIR "/src/GerbilManagerWebAPI"
+ARG configuration=Release
+RUN dotnet publish "GerbilManagerWebAPI.csproj" -c $configuration -o /app/publish /p:UseAppHost=false
+
+FROM base AS final
+WORKDIR /app
+COPY --from=build /app/publish .
+ENTRYPOINT ["dotnet", "GerbilManagerWebAPI.dll"]