Fix #187: fix redis-session.ini permission denied

[antoinetran]

Description of the change

Following closure of https://github.com/nextcloud/helm/pull/717 because of target branch develop deleted. This PullRequest targets main branch now.

Benefits

Possible drawbacks

Applicable issues

• fixes #

Additional information

Checklist

• [x] I have read the CONTRIBUTING.md doc.
• [x] DCO has been signed off on the commit.
• [x] Chart version bumped in Chart.yaml according to semver.
• [ ] (optional) Parameters are documented in the README.md