GH Actions isn't great compared to other CI systems, but it's also not particularly worse until you get into the nitty gritty details.

The most important advice is probably to put as much code as possible into locally runnable scripts written in a cross-platform scripting language (e.g. Python or Node.js) to avoid 'commit-push-ci-failure' roundtrips.

Only use the GH Actions YAML for defining the runtime environment and job dependency tree.

s/Node/Deno/ - direct repo/module references, no install step required.