Improve Helm chart CI pipeline

[monotek]

At the moment we see a timeout for Hono.
See:
#13
https://github.com/eclipse/packages/pull/13/checks?check_run_id=356689661

Pipeline also fails when non chart changes are made.
See:
#14
https://github.com/eclipse/packages/commit/0d5617c45244adcdec2aaa707d796b152648cec2/checks?check_suite_id=391476074

I'll try to improve this.