Add created date to the ManagedOSVersion common metadata fields

[anmazzotti]

Just to include the newly added created timestamp from: rancher/elemental-channels#64

This is an enabler if we want to display the build date of any image to the end user on the UI.

[davidcassany]

LGTM

[fgiudici]

LGTM
nit: I would consider changing "Created" as a field name with something like "CreationTimestamp" or "CreationDate" / "ReleaseDate"

[anmazzotti]

FYI @fgiudici I chose created because it is literally the same field of the image manifest, just converted to Unix time format.

skopeo inspect docker://registry.suse.com/suse/sl-micro/6.1/baremetal-os-container:2.2.0-3.9
{
    "Name": "registry.suse.com/suse/sl-micro/6.1/baremetal-os-container",
    "Digest": "sha256:98ca3c5db564c38ae2f3087b80a916be1b6a0a95154bdc75ef2d9af5f9dcb2e5",
    "Created": "2024-11-26T15:52:23.965935128Z",
.
.
.

[fgiudici]

FYI @fgiudici I chose created because it is literally the same field of the image manifest, just converted to Unix time format.

skopeo inspect docker://registry.suse.com/suse/sl-micro/6.1/baremetal-os-container:2.2.0-3.9
{
    "Name": "registry.suse.com/suse/sl-micro/6.1/baremetal-os-container",
    "Digest": "sha256:98ca3c5db564c38ae2f3087b80a916be1b6a0a95154bdc75ef2d9af5f9dcb2e5",
    "Created": "2024-11-26T15:52:23.965935128Z",
.
.
.

Oh I see, makes sense... thanks for sharing