Implement support for worker tags #198
Open
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This PR adds support for tagging workers with arbitrary tags and filtering jobs that are dispatched to them. Each worker can have between 0 to N tags, and each tag can be associated with 0 to N tag rules.
A tag rule acts as a gatekeeper for rebuild jobs, preventing any jobs that do not match the name pattern and the optional version pattern from being picked up by the worker. In the proposed implementation, this means that a tagged worker will not pick up any untagged jobs.
Untagged workers exclusively pick up jobs that do not match any tag rules.
Tags and tag rules can be managed via the REST API or rebuildctl.