[rawhide] Switch to ostree-format: "oci"

[cgwalters]

(Take 2, now that we have coreos/coreos-assembler#2417 )

Part of coreos/fedora-coreos-tracker#812

In this initial step, we're merely switching the internal
tarball to be a different format.

A future step will change the FCOS pipeline to automatically
push this container to quay.io.

[jlebon]

Cool, let's do it!

[dustymabe]

LGTM

[cgwalters]

I forced a rawhide build to try to ship this (before a package change): https://jenkins-fedora-coreos.apps.ocp.ci.centos.org/job/fedora-coreos/job/fedora-coreos-fedora-coreos-pipeline/2703/console

[cgwalters]

12:53:47  Verifying OSTree signature
12:53:47  Valid signature from Fedora <fedora-36-primary@fedoraproject.org> (53DED2CB922D8B8D9E63FD18999F7CBF38AB71F4)
12:53:47  **
12:53:47  OSTree:ERROR:src/libostree/ostree-core.c:128:ostree_metadata_variant_type: code should not be reached
12:53:47  Bail out! OSTree:ERROR:src/libostree/ostree-core.c:128:ostree_metadata_variant_type: code should not be reached
12:53:47  Traceback (most recent call last):
12:53:47    File "/usr/lib/coreos-assembler/cmd-sign", line 275, in <module>
12:53:47      sys.exit(main())
12:53:47    File "/usr/lib/coreos-assembler/cmd-sign", line 42, in main
12:53:47      args.func(args)
12:53:47    File "/usr/lib/coreos-assembler/cmd-sign", line 95, in cmd_robosignatory
12:53:47      robosign_ostree(args, s3, build, gpgkey)
12:53:47    File "/usr/lib/coreos-assembler/cmd-sign", line 183, in robosign_ostree
12:53:47      subprocess.check_call(['rpm-ostree', 'ex-container', 'export', '--repo=tmp/repo', checksum, f'oci-archive:{exported_ostree_path}:latest'])
12:53:47    File "/usr/lib64/python3.9/subprocess.py", line 373, in check_call
12:53:47      raise CalledProcessError(retcode, cmd)
12:53:47  subprocess.CalledProcessError: Command '['rpm-ostree', 'ex-container', 'export', '--repo=tmp/repo', '2d38cc95545494b10dc558af94ca8dcab72bf638bf55f3ba33de63fe70d47ff1', 'oci-archive:builds/36.20210915.91.0/x86_64/fedora-coreos-36.20210915.91.0-ostree.x86_64.ociarchive:latest']' died with <Signals.SIGABRT: 6>.

OK right this depends on https://bodhi.fedoraproject.org/updates/FEDORA-2021-75d8c7ab23 which is just stable now. So I guess it's easiest to wait till tomorrow to rebuild cosa.

[dustymabe]

So I guess it's easiest to wait till tomorrow to rebuild cosa.

i think you'd probably want to do a nocache hack. No guarantee the next build wouldn't use the cache.