Build a Minimal API with HereDoc and Docker

With Docker supporting HereDoc we are now able to create a full minimal API within a docker file, allowing us to use a single file build everything we need.

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``` Dockerfile
# syntax=docker/dockerfile:1.4
# specify base image
FROM mcr.microsoft.com/dotnet/sdk:6.0 AS build-env
# create directory
WORKDIR /app
# Create the csproj file with Here Dock
COPY <<EOF demo.csproj
<Project Sdk=”Microsoft.NET.Sdk.Web”>
 <PropertyGroup>
 <TargetFramework>net6.0</TargetFramework>
 <Nullable>enable</Nullable>
 <ImplicitUsings>enable</ImplicitUsings>
 </PropertyGroup>
</Project>
EOF
# restoring the csproj file
RUN dotnet restore
# creating the program.cs for out .net application with heretic
COPY <<EOF Program.cs
 var builder = WebApplication.CreateBuilder(args);
 var app = builder.Build();
 app.MapGet(“/hello”, () => “Hi There from docker file”);
 app.MapGet(“/teamLH”, () => “7 times world champion”);
 app.Run();
EOF
# publishing our application
RUN dotnet publish -c Release -o out
# preparing the final image
FROM mcr.microsoft.com/dotnet/aspnet:6.0
EXPOSE 80
EXPOSE 443
WORKDIR /app
COPY — from=build-env /app/out .
ENTRYPOINT [ “dotnet”, “demo.dll” ]
```

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