Peter Goldstein

This PR migrates CI to GitHub Actions. It copies the configuration from `trailblazer-activity`, including Ruby 3.1 and an upgraded checkout action. Runs green on my fork.

Add CI using GitHub Actions

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Adds CI to the repo using GitHub Actions

This PR migrates CI from Travis.org (which is no longer active) to GitHub Actions. As part of that migration it also: 1. Adds testing for more recent Ruby versions 2....

Also updates the checkout action and adds dependabot for GitHub Actions

In addition to the update of the GitHub Actions configuration this PR: * Added Gemfiles for compatible Rails versions * Updated use of safe_load to be compatible with Psych 4

CONTRIBUTING.md is out of date

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### Expected Behaviour CONTRIBUTING.md should reflect the current tools (GitHub Actions / Dependabot) for CI and dependency update ### Current Behaviour (for problems) The file refers to Travis and Gemnasium,...

This turned into a bit bigger of a PR than I originally anticipated, because a number of the gems in the Gemfile were either unmaintained or no longer applicable and...

Runs green on my fork.

As Travis CI.org is no more, this migrates CI to GitHub Actions. Runs green on my fork without any deprecation warnings.