[v0.58] Don't abort listing tags when we encounter a digest

[TomSweeneyRedHat]

Setting c/common v0.58.4 up to handle containers/skopeo#2346, that happens
in the wild.

[openshift-ci]

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[packit-as-a-service]

We were not able to find or create Copr project packit/containers-common-2069 specified in the config with the following error:

Cannot create a new Copr project (owner=packit project=containers-common-2069 chroots=['epel-9-x86_64', 'centos-stream-10-x86_64']): Response is not in JSON format, there is probably a bug in the API code.

---

Please check your configuration for:

1. typos in owner and project name (groups need to be prefixed with @)
2. whether the project name doesn't contain not allowed characters (only letters, digits, underscores, dashes and dots must be used)
3. whether the project itself exists (Packit creates projects only in its own namespace)
4. whether Packit is allowed to build in your Copr project
5. whether your Copr project/group is not private

[TomSweeneyRedHat]

@cevich or maybe @lsm5 any thoughts on the COPR issue?

[lsm5]

/packit build

[mtrmac]

/lgtm