Get faster GitLab runners with a ramdisk

Many cloud providers give you lots of memory with each instance and you can speed up tests and builds by using a ramdisk.
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buildah error: vfs driver does not support overlay.mountopt options

Buildah and podman work well with the vfs storage driver, but the default mount options can cause problems.
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Build containers in GitLab CI with buildah

My team at Red Hat depends heavily on GitLab CI and we build containers often to run all kinds of tests. Fortunately, GitLab offers up CI to build containers and a container registry in every repository to hold the containers we build. This is really handy because it keeps everything together in one place: your container build scripts, your container build infrastructure, and the registry that holds your containers. Better yet, you can put multiple types of containers underneath a single git repository if you need to build containers based on different Linux distributions.
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