Add targets to create OIDC clients for dashboard and tank

Currently you can call the Django management commands to create the OIDC clients inside the running container, but you need to provide all the arguments in the command line.

We need Makefile targets to create the OIDC clients inside the running container using the environment variable provided in the .env file.

changed milestone to %1.0-alpha2 — Precise Pheasant

assigned to @eigenwijsje

added P3 label

marked this issue as related to aura#184 (closed)

closed with commit fdf2c6fd