feat(chart): make timezone configurable for the act_runner (#38)

Once: https://gitea.com/gitea/act_runner/pulls/738
Is merged.
Then this can be applied to specify timezone for example for cases such as:

![image.png](/attachments/436c1772-da20-4904-af0b-cb5111d6c6cf)

Right now the correct time has to be retrieved with a ENV variable in the cmd: `git commit -m "Update custom ISO: $(TZ=Europe/Amsterdam date +'%Y-%m-%d %H:%M')" || echo "No changes to commit"`

Co-authored-by: Daan Selen <dselen@systemec.nl>
Reviewed-on: https://gitea.com/gitea/helm-actions/pulls/38
Reviewed-by: techknowlogick <techknowlogick@noreply.gitea.com>
Co-authored-by: Daan Selen <dselen@nerthus.nl>
Co-committed-by: Daan Selen <dselen@nerthus.nl>

values.yaml

@@ -5,6 +5,7 @@
 ## @param init.image.repository The image used for the init containers
 ## @param init.image.tag The image tag used for the init containers
 ## @param statefulset.replicas the amount of (replica) runner pods deployed
+## @param statefulset.timezone is the timezone that will be set in the act_runner image
 ## @param statefulset.annotations Act runner annotations
 ## @param statefulset.labels Act runner labels
 ## @param statefulset.resources Act runner resources
@@ -29,6 +30,7 @@
 enabled: false
 statefulset:
   replicas: 1
+  timezone: Etc/UTC
   annotations: {}
   labels: {}
   resources: {}