As a developer i want to create a new environment when a new PR is opened so i can test that PR’s Code in isolation without having to merge the code to dev

trellis
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It doesn’t cover all of your use cases, but take a look at this, particularly the examples, which includes a dry-run action.

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Trellis Deployment with GitHub Actions trellis
Introducing Trellis GitHub Deployment. rocket Trellis GitHub Deployment Automatically deploy your Trellis-based WordPress site to staging and production environments on merge to staging and main branches respectively, and keep plugins, themes, and WordPress core up to date with Dependabot. Features rocket Automatic (or manual) deployment to staging and production environments using GitHub Actions when pull requests are merged to your staging and main branches respectively. …