feat: add ability to remove the .runner file within the helm chart (#126)

fix: https://gitea.com/gitea/helm-actions/issues/73
---------

Co-authored-by: DaanSelen <dselen@systemec.nl>
Reviewed-on: https://gitea.com/gitea/helm-actions/pulls/126

values.yaml

@@ -26,8 +26,9 @@
 ## @param statefulset.actRunner.pullPolicy The Gitea act runner pullPolicy
 ## @param statefulset.actRunner.fullOverride Completely overrides the image registry, path/image, tag and digest.
 ## @param statefulset.actRunner.extraVolumeMounts Allows mounting extra volumes in the act runner container
-## @param statefulset.actRunner.config [default: Too complex. See values.yaml] Act runner custom configuration. See [Act Runner documentation](https://docs.gitea.com/usage/actions/act-runner#configuration) for details.
 ## @param statefulset.actRunner.extraEnvs Allows adding custom environment variables
+## @param statefulset.actRunner.flushCache whether to clear the .runner (cache) file by creating an extra init container, can slightly increase boot-up time
+## @param statefulset.actRunner.config [default: Too complex. See values.yaml] Act runner custom configuration. See [Act Runner documentation](https://docs.gitea.com/usage/actions/act-runner#configuration) for details.
 #
 ## @param statefulset.dind.rootless [default: false] a simple flag to let helm know we are dealing with a rootless dind container
 ## @param statefulset.dind.uid a field to set the running user id for the rootless dind container, so it knows where to look for the socket
@@ -82,6 +83,8 @@ statefulset:
       #     fieldRef:
       #       fieldPath: metadata.name
 
+    # See full details: https://gitea.com/gitea/helm-actions/issues/73
+    flushCache: false
     # See full example here: https://gitea.com/gitea/act_runner/src/branch/main/internal/pkg/config/config.example.yaml
     config: |
       log: