feat : simplify plugin ecosystem (init-container)

[smarchone]

Changes :

• init-container:

  • airflow deploys - init container + executor container
  • fetches config : airflow to load config onto init-container & executor container
    • default_env + fetched_env in airflow
  • fetches assets : init container to load assets onto shared volume

• job run-input api : to compile + fetch assets; instead of admin build instance

[coveralls]

Pull Request Test Coverage Report for Build 3441208627

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 78.474%

---

Totals
Change from base Build 3416779019:	0.0%
Covered Lines:	7951
Relevant Lines:	10132

---

💛 - Coveralls