T5531: Containers add label option

[sever-sever]

Change Summary

Ability to set labels for container

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Code style update (formatting, renaming)
• Refactoring (no functional changes)
• Migration from an old Vyatta component to vyos-1x, please link to related PR inside obsoleted component
• Other (please describe):

Related Task(s)

• https://vyos.dev/T5531

Component(s) name

container

Proposed changes

How to test

VyOS configuration:

set container name c1 allow-host-networks
set container name c1 image 'busybox'
set container name c1 label mypods value 'My label for containers'

Check labels:

sudo podman  inspect c1
...
               "Labels": {
                    "PODMAN_SYSTEMD_UNIT": "vyos-container-c1.service",
                    "mypods": "My label for containers"
               },

Checklist:

• I have read the CONTRIBUTING document
• I have linked this PR to one or more Phabricator Task(s)
• I have run the components SMOKETESTS if applicable
• My commit headlines contain a valid Task id
• My change requires a change to the documentation
• I have updated the documentation accordingly

[mgolisch]

i think an error slipped into this one.
By setting env_opt to an empty string all pods created have none of the configured environment variables set.

[fisherbln]

i think an error slipped into this one.
By setting env_opt to an empty string all pods created have none of the configured environment variables set.

confirmed on my end. All my env vars are wiped out of my containers after this was implemented.