Swap to env files (actions#200)

* Swap to env files

* revert to old method for tests

* disable executing of commands during tests

* bump package.json @actions/core version

Update v2-beta tag

Swap to Environment files on V1 release (actions#201)

* Swap to env files

* bump actions/core version

Update v1 tag

Update Third Party Licenses (actions#179)

Switch from "master" to "main" branch (actions#171)

* Switch from "master" to "main" branch

* Update README.md

Implement "check-latest" flag to check if pre-cached version is lates…

…t one (actions#165)

download from node-versions and fallback to node dist (actions#147)

* download LTS versions from releases

* support upcoiming ghes 

Co-authored-by: eric sciple <ericsciple@users.noreply.github.com>

Merge pull request actions#142 from actions/joshmgross/run-tests-on-w…

…indows

Run test job on windows-latest

Update tool-cache for download retries (actions#120)