feature: add worker image pull secret name

[wcp1231]

Hi, all

Could I have a review for this patch. I would be very grateful.

The official image is out of date, so I built an image and pushed it to our private registry, then found that it needs set pull secret to pull the elastic worker image from the private registry.

This patch adds the image-pull-secret-name option to the master node so that it can pull image from the private registry when scheduling a worker pod.

Thanks

[D-D-H]

Please sign the eca.

Thanks!

[wcp1231]

The change looks good to me.

Please update the doc located at:

• https://github.com/eclipse/jifa/blob/main/site/docs/guide/configuration.md
• https://github.com/eclipse/jifa/blob/main/site/docs/zh/guide/configuration.md

Okay, I've updated the doc and sign the eca.

[D-D-H]

Thanks for the contribution.

I updated the commit title ('feature' -> 'feat') to keep consistent.