feat: Add helm chart

[Planlos5000]

Description

Add a helm chart for easy kubernetes deployment

Changelog

• Add a helm chart
• Add unit tests for the helm chart
• Add tilt file for a test deployment

Checklist

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas

[github-actions]

The deployment to the dev cluster was successful. You can find the deployment here: https://4863.development.scrumlr.fra.ics.inovex.io
This deployment is only for testing purposes and will be deleted after 1 week.
To redeploy rerun the workflow.
DO NOT STORE IMPORTANT DATA ON THIS DEPLOYMENT

Deployed Images

• ghcr.io/inovex/scrumlr.io/scrumlr-frontend:sha-748310a

• ghcr.io/inovex/scrumlr.io/scrumlr-server:sha-748310a

[octomind-dev]

🐙 Octomind

Test Report: 14/14 successful.

description	status	details
About Section Visibility Test	Passed ✅	click
change avatar	Passed ✅	click
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close cookie banner - sign-in	Passed ✅	click
create and delete board columns	Passed ✅	click
create_and_delete_notes_and_actions_v2	Passed ✅	click
create lean coffee board	Passed ✅	click
edit_notes_and_actions_v5	Passed ✅	click
get started	Passed ✅	click
share_session	Passed ✅	click
sign-in	Passed ✅	click
test all ways to open the setup flow	Passed ✅	click

commit sha: 748310a