Feature: Add test for enabling redis to ci

[jessebot]

Description of the change

I'd like to add an isolated redis test to our CI to ensure this chart works properly with redis. It would go somewhere in here:

helm/.github/workflows/lint-test.yaml

Lines 69 to 83 in bf6cc4a

	test_cases:
	# test the plain helm chart with nothing changed
	- name: 'Default - no custom values'
	# test the helm chart with postgresql subchart enabled
	- name: PostgreSQL Enabled
	helm_args: '--helm-extra-set-args "--set=postgresql.enabled=true --set=postgresql.global.postgresql.auth.password=testing123456 --set=internalDatabase.enabled=false --set=externalDatabase.enabled=True --set=externalDatabase.type=postgresql --set=externalDatabase.password=testing12345"'
	# test the helm chart with nginx container enabled
	- name: Nginx Enabled
	helm_args: '--helm-extra-set-args "--set=image.flavor=fpm --set=nginx.enabled=true"'
	# test the helm chart with horizontal pod autoscaling enabled
	- name: Horizontal Pod Autoscaling Enabled
	helm_args: '--helm-extra-set-args "--set=hpa.enabled=true --set=hpa.minPods=2 --set=hpa.maxPods=3 --set=hpa.targetCPUUtilizationPercentage=75"'

Benefits

Ensure this chart works properly with redis, and will also make sure we catch breaking changes in the bitnami chart, if they happen.

Possible drawbacks

Another test to maintain. 😅