OCI entrypoint configuration

[gwenya]

Closes #1558.

@stgraber do we need an API extension for this?

[stgraber]

Yeah, that needs an API extension.

[stgraber]

There seems to be a problem with the DCO (Signed-off-by) too?

[gwenya]

Ah yeah I forgot to sign off again, I’ll fix it when I add the api extension.

[stgraber]

@gwenya do you think you'll have the time to do those changes in the next few hours?
I'm going to be tagging Incus 6.11 later today, would be nice to have this in there!

[stgraber]

I'm going to handle the rebase and quick fixup myself given the conversation above confirms it was just an accidental omission. That way we can get this merged before tagging 6.11.

[stgraber]

I've done:

• Add API extension commit
• Split your commit into 3
• Fixed missing Signed-off-by
• Added logic to set an initial value for the new config keys during creation

Seems to work quite well:

stgraber@castiana:~$ incus launch oci-docker:nginx nginx
Launching nginx
stgraber@castiana:~$ incus config show nginx | grep oci\\.
  oci.cwd: /
  oci.entrypoint: /docker-entrypoint.sh nginx -g 'daemon off;'
  oci.gid: "0"
  oci.uid: "0"
stgraber@castiana:~$ incus list nginx
+-------+---------+----------------------+------------------------------------------------+-----------------+-----------+
| NAME  |  STATE  |         IPV4         |                      IPV6                      |      TYPE       | SNAPSHOTS |
+-------+---------+----------------------+------------------------------------------------+-----------------+-----------+
| nginx | RUNNING | 10.244.64.186 (eth0) | fd42:a02f:ead8:977b:1266:6aff:fe72:bd90 (eth0) | CONTAINER (APP) | 0         |
+-------+---------+----------------------+------------------------------------------------+-----------------+-----------+
stgraber@castiana:~$ 

[gwenya]

awesome, thank you!