Adding support for Power Linux (ppc64le) platform

[SunidhiGaonkar]

Summary:
I am creating this issue to request the community to provide quay.io/ansible/receptor:devel image for Power Linux (ppc64le) platform.
I am trying to Port AWX on Power Linux and this image is used as Base development image. I was able to build and test this image
on Power Linux (ppc64le) platform , attached below are the build and test logs and the steps that I followed for the same.

Steps and logs

[seth-priya]

Hi Team, any thoughts on above? thanks!

[shanemcd]

We build and push our container images using GitHub Actions. Since they do not support ppc64le there's no way for us to do this right now. I'll leave open so we can do this if and when that happens.

[Sunidhi-Gaonkar1]

Hi Team,
We are trying to enable cross builds for the image, we could use the docker buildx tool to cross compile docker images for ppc64le on GitHub actions.

[Sunidhi-Gaonkar1]

Hi Team, In reference to this issue we have raised a PR implementing a cross-platform buildx approach.
We have used the QEMU setup and docker buildx tool to create a Multi-arch image for ppc64le on GitHub actions.
We have tested the workflows and mentioned the link for the same in the PR raised :#638.