Automate release process

[gmsantos]

As noted in #10, the build process for new releases for this action is manual. High-level steps are:

• Create a new PR with changes
• Update npm dependencies if applicable
• Recreate the dist/index.js file by executing npm run package from local
• Push the updated dist to your PR
• Merge the PR
• Create GitHub releases and tags for easier reference

Automating this process would make the release process more consistent.

[stale]

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