Add support of RUN_DIR

Run Directory

You can run the git-crypt unlock command from a different directory besides GITHUB_WORKSPACE by setting a RUN_DIR env var.

Thanks @adevine for your contribution

Add git-lfs support

This release just adds git-lfs support and also updates the README with latest version.

Faster build!

Switched to alping thanks to @garciasdos.

He also added unit tests.

#4 should also be fixed thanks to @alexburlton-sonocent

Adding action.yaml

No functional change.

Documentation fix

Just fix a small error in the README.

Initial release

The initial release of the git-crypt-unlock action which lets you unlock secrets from a base64 encoded secret-key.

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