use buildah (and podman) instead of docker

Abderrahim Kitounirequested to merge
abderrahim/buildah into master

This simply uses buildah bud (a.k.a. build-using-dockerfile) and doesn't change anything.

Tried changing the diagnostic commands in after_script to use podman, but podman image inspect can't seem to access the id.

Since buildah can't run containers, the flatpak list in after_script uses podman instead.

Edited by Abderrahim Kitouni

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