While a bulid, I encountered a following error.

Kubernetes: The Pod "xxx" is invalid: xxx.xxx.imagePullPolicy: Unsupported value: "always": supported values: "Always", "IfNotPresent", "Never"

Command execution failed (command: kubectl create -f /opt/onedev/temp/server/k8s9757985897876130412.yaml -o jsonpath={.metadata.name}, exit code: 1)

I discovered the place which specify "always" to imagePullPolicy. https://github.com/theonedev/onedev/blob/0825f0b20a19a27f81fa03232324a69914a1e599/server-plugin/server-plugin-executor-kubernetes/src/main/java/io/onedev/server/plugin/executor/kubernetes/KubernetesExecutor.java#L746

I'm very happy if you change this "always".

Thank you for the great project.