Introduce new Command in Dhall to run job along with postgres docker

[dkijania]

Added new dhall Command definition which can simplify running tests which requires postgres database running along with some initial script.

Usage:

in Dhall test definition

 RunWithPostgres.runInDockerWithPostgresConn
          ([] : List Text)
           "./src/test/archive/sample_db/archive_db.sql"
           Artifacts.Type.Archive 
           "./buildkite/scripts/replayer-test.sh"

where

• first argument extends environment variables passed to docker
• second argument defines init script which will be run against schema before script
• third defines which debians will be installed
• fourth argument defines which script will be run against database

There are 4 env variables passed to the docker, so script can use them for connection:

"PG_PORT","POSTGRES_USER,"POSTGRES_PASSWORD","POSTGRES_DB","PG_CONN"

[dkijania]

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