Publish Container Image for multiple Platforms

[phenixblue]

Right now it look the binary of kubestr is cross compiled for different platforms, but the container image used to run FIO tests is not.

Since you're using Github Actions for building the image, I think your workflow only needs slight modifications to accomplish this and make kubestr operable across multiple platforms. Here's an example of another project already doing this: https://github.com/phenixblue/imageswap-webhook/blob/master/.github/workflows/ci-image-build.yaml