CI pipelines are enqueued for far too long

[canterberry]

Lately, Travis CI builds have been sitting idle in a queued state for a very long time (30m+) before running. While we do not have a formal SLA for expectations around CI pipeline execution time, this is far beyond an acceptable response time. Further, travis-ci.org is being decommissioned.

Acceptance Criteria

• [ ] Select a CI pipeline service that can provide guarantees of prompt pipeline execution.
• [ ] Create and configure a CI pipeline for this repo that performs, at minimum, the same work as the current Travis CI pipeline.

Options

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...other?

[canterberry]

Reference: https://travis-ci.org/github/phusion/node-sha3/builds/756743757 Build requested at ~9:00 AM Pacific. Still waiting ~3 hours later.