added no-store header to st2 nginx configuration #5352

Job	Run time
Skip Duplicate Jobs Pre Job	4s
Lint Checks (black, flake8, etc.) - Python 3.8	2m 10s
Self-check on Python 3.8 - Python 3.8	7m 32s
Compile (pip deps, pylint, etc.) - Python 3.8	3m 25s
Lint Checks (black, flake8, etc.) - Python 3.9	2m 8s
Compile (pip deps, pylint, etc.) - Python 3.9	3m 20s
Pack Tests - Python 3.8	1m 51s
Unit Tests (chunk 1) - Python 3.8	6m 9s
Integration Tests (chunk 1) - Python 3.8	4m 23s
Unit Tests (chunk 2) - Python 3.8	4m 35s
Integration Tests (chunk 2) - Python 3.8	5m 21s
Unit Tests (chunk 1) - Python 3.9	6m 26s
Pack Tests - Python 3.9	2m 2s
Unit Tests (chunk 2) - Python 3.9	4m 50s
Integration Tests (chunk 1) - Python 3.9	4m 18s
Integration Tests (chunk 2) - Python 3.9	5m 34s
Slack notification for failed master builds	7s
	1h 4m 15s

Provide feedback