e2e: committing the finished image: layer not known

[edsantiago]

One I'd never seen before, in rawhide remote root:

  [It] podman image rm - concurrent with shared layers
...
Error: committing container for step {
   Env:[PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin]
   Command:run
   Args:[touch rmtest:3]
   Flags:[]
   Attrs:map[]
   Message:RUN touch rmtest:3
   Original:RUN touch rmtest:3
}: copying layers and metadata for container "6f9afa8a44e2f2382a686ddbe1447bc22fbc11b09fc126c0c4fb1eaa538ba39a":
    committing the finished image: creating image "d68f34049f32151465f43d95209e1dfe2769b45d0ef65e7be32f621325349de3":
    layer not known

This is a 10-parallel-jobs test, so it's hard to say what's going on.

Suggestion: instrument common_test.go:buildImage() to emit the commands it's running and their output. I don't think they'll help much here, but maybe, and maybe that'll help in a future test failure.

[edsantiago]

Closing in favor of #18659.