Add new Dockerfile for pipeline container usage

[seantleonard]

Why make this change?

• Part of Pipeline migration #2095

What is this change?

• Used by pipelines to build Docker container.
• This Dockerfile assumes that pre-built DAB bits are provided to the Docker context.
• The provided built binaries are in path /src/out/engine/net6.0

How was this tested?

• Pipeline

• Local run of docker build -> docker compose ->

• In the docker build step, C:\<repo_root_with_project_built> just means: clone repo and build dab with dotnet build. pass the path pointing to the root of the repo.

• the arg -f "C:\dockertest-ob\Dockerfile" should point to the Dockerfile e.g. the file this pr adds.

docker build -t local-dab-container:sean -f "C:\dockertest-ob\Dockerfile" C:\<repo_root_with_project_built>

docker compose -f "C:\dockertest-ob\docker-compose-mssql.yml" --verbose up

Sample docker compose file:

version: "3.9"
services:
  hawaii:
    image: "local-dab-container:sean"
    ports:
      - "5000:5000"
    volumes:
      - "C:/dockertest-ob/dab-config.MsSql.json:/App/dab-config.json"

[seantleonard]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 2 pipeline(s).