feat: multiplatform build setup - linux/arm64

[kkulak]

Description

I couldn't run your operator on the EKS with ARM nodes, but I've managed to build the image locally with linux/armd64 target platform. I had to upgrade bitnami/kubectl:1.21.8 as well, because it was not supporting multiplatform builds: right now it does.

It's my first contribution to the project, so please check the changes carefully.

Is there any chance to get this reviewed, merged and released anytime soon? @gold-kou @R-HNF

Checklist

Please check if applicable

• [ ] Tests have been added (if applicable, ie. when operator codes are added or modified)
• [ ] Relevant docs have been added or modified (if applicable, ie. when new features are added or current features are modified)

Might be related to https://github.com/st-tech/gatling-operator/issues/74

[kkulak]

@kane8n @gold-kou thanks for the reviews! May I ask one of You to merge the PR and release the operator? I don't have the required permissions to do it on my own.

[kane8n]

@kkulak Thanks for the PR, we released it as v0.9.5!