Fix Default Port issue in Helm Chart

[idjohnson]

Fix Helm chart - pod crashes with default values - requires a port to be set.

Description of the change

This change sets the default port for the Uptime Kuma container which is, by default, 3001.

Benefits

Fixes crashes when using the helm chart with default values

Possible drawbacks

Uptime Kuma can use a few env vars for options.port. However , I chose UPTIME_KUMA_PORT as the default to use.

Applicable issues

• fixes #1138

Additional information

Tested locally in K3s on v1.23.3+k3s1 (see freshbrewed.science for blog about Uptime Kuma and how I used)

Checklist

• [x] Chart version bumped in Chart.yaml according to semver.
• [x] Variables are documented in the README.md

[dirsigler]

Hey @idjohnson

thank you very much for your contribution! I added the change now to my MR #44 .

Therefore I close this one here. Thank you very much <3