Migrate action to Typescript

[edif2008]

This PR migrates most of the functionality of the GitHub Action to Typescript.

Key elements used in the migration

Element	Explanation
op-js	Typescript package that wraps 1Password CLI commands. It enables us to easily work with the output returned by the 1Password CLI.
core.setOutput	Make the secret available as a step's output (works with multiline secrets as well).
core.exportVariable	Make the secret available as an environment variable (works with multiline secrets as well).
core.setSecret	Ensures the secret is masked in logs.
core.setPath	Add the path to the CLI to be able to call it in further parts of the action, as well as other steps in the pipeline.

Migration process

The commits should show an overview of the steps of the migration. I will present here the details of the main migration step highlighted in 6c9a28c:	Functionality from entrypoint.sh	Functionality in index.ts
unset_prev_secrets	unsetPrevious
auth validation (no dedicated function)	validateAuth
install_cli	installCLI
extract_secrets	loadSecrets
populating_secret	extractSecret

Notes

• installCLI in index.tx only executes the shell script that will perform the CLI installation. No real migration has been performed for this part of the action.

• I've made lint to ignore the following lines:	Code	Lint rule	Reason
  !process.env[envConnectHost].startsWith("http://")	no-restricted-syntax	Error message doesn't apply (Use https instead of http in URLs) since we perform a check for the prefix http://.
  const installCLI = async (): Promise<void> =>	@typescript-eslint/naming-convention	We have an exception here with the CLI being all capitalized.
  expect(process.env[envConnectHost]).toBe("http://localhost:8080");	no-restricted-syntax	Error message doesn't apply (Use https instead of http in URLs) since we perform a check on whether the prefix http:// was properly appended.

• I'm open for suggestions if there are better function names we can use for our new implementation.

[dustin-ruetz]

Overall note: awesome work on this TypeScript migration, @edif2008! 👏

Everything looks very solid and works well from my testing. I left a bunch of file-specific feedback in my review yesterday and some additional comments today.

Just a few remaining general thoughts:

1. src/utils.ts currently has four functions in it, so I'd be in favour of splitting these out into their own files in a src/utils/ directory. They could each then get their own test suites too under src/utils/__tests__/*.test.ts. IMO this change would make future maintenance/refactoring easier.
2. Can we split out installCLI and loadSecrets into their own files in src/utils/ as well?
3. This would leave src/index.ts with just the run function in it. Is there a clearer name that we can use for this function? Perhaps even just something like loadSecretsAction, since it's representative of the main functionality for this package?
4. It'd be great if we could add unit tests for installCLI, loadSecrets and run as well.

Happy to help wherever I can with the above list, especially the unit tests.

To conclude this review - once again, great work on this PR!

[kylekurz]

Any chance this can get merged and an update to this action released? We'd like to incorporate it into some of our pipelines, but would like to have it pull in a modern build instead of the 2.10 that is in the current "live" action.