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CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+## [1.0.0] - 2022-06-13
+
+### Added
+
+- NodeJS GitHub Action to download and install Nextflow
+- GitHub Actions workflow to test Nextflow installation and downstream usage
+- Documentation and license files
+
+[unreleased]: https://github.com/MillironX/setup-nextflow/compare/v1.0.0...HEAD
+[1.0.0]: https://github.com/MillironX/setup-nextflow/releases/tag/v1.0.0

README.md

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+# Setup Nextflow for GitHub Actions
+
+[![Testing](https://github.com/MillironX/setup-nextflow/actions/workflows/example.yml/badge.svg)](https://github.com/MillironX/setup-nextflow/actions/workflows/example.yml)
+[![MIT License](https://img.shields.io/github/license/MillironX/setup-nextflow?logo=opensourceinitiative)](https://github.com/MillironX/setup-nextflow/blob/master/LICENSE)
+[![GitHub tag (latest by date)](https://img.shields.io/github/v/tag/MillironX/setup-nextflow?logo=github)](https://github.com/MillironX/setup-nextflow/releases/latest)
+[![Get from GitHub Actions](https://img.shields.io/static/v1?label=actions&message=marketplace&color=green&logo=githubactions)](https://github.com/marketplace/setup-nextflow)
+
+An action to install [Nextflow](https://nextflow.io) into a GitHub Actions workflow and make it available for subsequent steps.
+
+## Quick start
+
+```yaml
+name: Example workflow
+on: push
+jobs:
+  example:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-java@v3
+        with:
+          distribution: "temurin"
+          java-version: "11"
+      - uses: MillironX/setup-nextflow@v1
+        with:
+          version: "21.10"
+          all: false
+          token: ${{ secrets.GITHUB_TOKEN }}
+      - run: nextflow help
+```
+
+## Inputs
+
+### `version`
+
+> **default: `latest`**
+
+A version string to specify the version of Nextflow to install. This version number will try to resolve using [npm's semantic versioning](https://github.com/npm/node-semver), so
+
+- `version: 21`
+- `version: 21.10`
+- `version: 21.10.6`
+
+will all download Nextflow version 21.10.6 as of 13 June 2022. Since Nextflow does not use true semantic versioning, you should **always** specify at least the minor version (e.g. `version: 21.10`).
+
+Edge releases are resolved as pre-release, see <https://github.com/npm/node-semver#prerelease-tags> for more details. In short, in nearly all cases, passing an `-edge` release to this action will need to specify the _exact_ edge release targeted.
+
+There are three (technically four) aliases to assist in choosing up-to-date Nextflow versions.
+
+- `version: latest-stable` (alias `version: latest`)
+
+    This will download the latest _stable_ release of Nextflow.
+
+- `version: latest-edge`
+
+    This will download the latest _edge_ release of Nextflow. Note that edge releases may be _older_ than the latest stable release. See https://github.com/nextflow-io/nextflow/issues/2467
+
+- `version: latest-everything`
+
+     This will download the latest release of Nextflow, regardless of stable/edge status.
+
+### `all`
+
+> **default: `false`**
+
+A boolean deciding whether to download the "all versions" distribution of Nextflow. May be useful for running tests against multiple versions downstream.
+
+### `token`
+
+> **default: `${{ secrets.GITHUB_TOKEN }}`**
+
+This action locates the releases based upon the GitHub API, and requires an access token. The default token provided with all GitHub actions should be sufficient for all use cases.
+
+## Outputs
+
+There are no outputs from this action.