[Hacktoberfest] ImagePullCache fields may be 'final'

[manusa]

Description

The following statement is reported as a code style issue:

https://github.com/eclipse/jkube/blob/c15c4bb8b7cc4ea7502f8314b1e067b27f9a1dda/jkube-kit/build/service/docker/src/main/java/org/eclipse/jkube/kit/build/service/docker/ImagePullCache.java#L27

• [ ] should be changed to:

    private final Backend backend;

Before you start

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How to manually test my changes

Kubernetes

If you don't have a real Kubernetes cluster available (most probably), you can use Minikube or Kind to test with a local cluster.

• Minikube get started guide
• Kind (Requires Docker) quick start

OpenShift

If you don't have a real OpenShift cluster available (most probably), you can use Red Hat's developer Sandbox for Red Hat OpenShift. The only requirement is to have a Red Hat account.

Once you have your Sandbox environment, you'll need to download the oc tool from the cluster console. (Press the ? icon and from the context menu select Command line tools, you'll be redirected to https://$subdomain.openshiftapps.com/command-lines-tools where you'll be able to download the CLI for your platform)

[jhonDoe15]

Hi, @manusa can you assign me to this issue too? 😅

[manusa]

Just one first-timer issue per new contributor ;)

[ChinmayaSharma-hue]

Hi @manusa, can you assign this issue to me?

[prak30]

hey @ChinmayaSharma-hue if you are not working on this can I give it a try @manusa, @rohanKanojia can you assign this issue to me

[prak30]

hey @manusa i have created a pr https://github.com/eclipse/jkube/pull/1957 can you review and merge it