Add DigitalOcean fleeting plugin to community plugins

What does this MR do?

Adds the community-maintained DigitalOcean fleeting plugin to the community plugins
table in "Find a fleeting plugin".

The plugin lets the Docker Autoscaler and Instance executors autoscale onto
DigitalOcean droplets. It is published as a signed OCI artifact at
registry.gitlab.com/alexqrid/fleeting-plugin-digitalocean, built against the current
fleeting provider API, with unit tests and an opt-in integration suite running in CI.
It is maintained at
https://gitlab.com/alexqrid/fleeting-plugin-digitalocean.

As required for community entries, the note records the OCI reference, where to report
issues, the support and stability level, and where to find documentation.

None.

Author's checklist

/label documentation devopsverify grouprunner-core Category:Runner typemaintenance maintenancerefactor

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