Support ContainerEnvironmentVariables

[benvillalobos]

Fixes #179

Changes Made

Containerize, CreateNewImage, CreateNewImage (the tool task), and the targets have been modified to flow Environment Variables.

Also added a unit test that verifies it works by Console.Writing the value of the environment variable manually passed into the ParseContainerProeprties task.

Recommend a commit-by-commit review

[benvillalobos]

Note to self: docs link https://github.com/opencontainers/image-spec/blob/main/config.md

[baronfel]

We should overwrite here and make folks aware that this is the semantic. Otherwise, people can't do things like overwriting the ASPNETCORE_URLS variable on their own, since the dotnet/runtime-deps container includes that definition by default.

[benvillalobos]

This one's new. Something new about the web template? I'm confused about what could have changed here.

C:\Program Files\Microsoft Visual Studio\2022\Dogfood>docker run localhost:5010/endtoend_noapi:1.0
Unhandled exception. System.InvalidOperationException: Unable to configure HTTPS endpoint. No server certificate was specified, and the default developer certificate could not be found or is out of date.
To generate a developer certificate run 'dotnet dev-certs https'. To trust the certificate (Windows and macOS only) run 'dotnet dev-certs https --trust'.
For more information on configuring HTTPS see https://go.microsoft.com/fwlink/?linkid=848054.
   at Microsoft.AspNetCore.Hosting.ListenOptionsHttpsExtensions.UseHttps(ListenOptions listenOptions, Action`1 configureOptions)
   at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.AddressBinder.AddressesStrategy.BindAsync(AddressBindContext context, CancellationToken cancellationToken)
   at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.AddressBinder.BindAsync(IEnumerable`1 listenOptions, AddressBindContext context, CancellationToken cancellationToken)
   at Microsoft.AspNetCore.Server.Kestrel.Core.KestrelServerImpl.BindAsync(CancellationToken cancellationToken)
   at Microsoft.AspNetCore.Server.Kestrel.Core.KestrelServerImpl.StartAsync[TContext](IHttpApplication`1 application, CancellationToken cancellationToken)
   at Microsoft.AspNetCore.Hosting.GenericWebHostService.StartAsync(CancellationToken cancellationToken)
   at Microsoft.Extensions.Hosting.Internal.Host.StartAsync(CancellationToken cancellationToken)
   at Microsoft.Extensions.Hosting.HostingAbstractionsHostExtensions.RunAsync(IHost host, CancellationToken token)
   at Microsoft.Extensions.Hosting.HostingAbstractionsHostExtensions.RunAsync(IHost host, CancellationToken token)
   at Microsoft.Extensions.Hosting.HostingAbstractionsHostExtensions.Run(IHost host)
   at Program.<Main>$(String[] args) in C:\Users\bevillal\AppData\Local\Temp\CreateNewImageTest\Program.cs:line 25

[benvillalobos]

Turns out it was the default value we were setting ASPNETCORE_URLS to...

I stole the value it is set to by default: http://+:80, cc @baronfel

[benvillalobos]

Cleaned up the commit history, should be ready to merge. Un-drafting

[baronfel]

Nice work! Thanks for knocking this out.