Helm Chart Linting and Tests

Rework postgres access, introduce automated install/upgrade tests #1

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Run time

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Job	Run time
codespell	10s
test_extdb_ha_extsecret	6m 26s
test_extdb_ha_noextsecret	5m 9s
test_intdb_noha_noextsecret	3m 36s
	15m 21s