Introduce changesets

.changeset/README.md

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+# Changesets
+
+Hello and welcome! This folder has been automatically generated by `@changesets/cli`, a build tool that works
+with multi-package repos, or single-package repos to help you version and publish your code. You can
+find the full documentation for it [in our repository](https://github.com/changesets/changesets)
+
+We have a quick list of common questions to get you started engaging with this project in
+[our documentation](https://github.com/changesets/changesets/blob/main/docs/common-questions.md)

.changeset/config.json

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+{
+  "$schema": "https://unpkg.com/@changesets/config@2.0.0/schema.json",
+  "changelog": ["@changesets/cli/changelog", { "repo": "onflow/flow-js-testing" }],
+  "commit": false,
+  "fixed": [],
+  "linked": [],
+  "access": "public",
+  "baseBranch": "master",
+  "updateInternalDependencies": "patch",
+  "ignore": []
+}

.changeset/polite-apes-shop.md

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+---
+"flow-js-testing": patch
+---
+
+Introduce changesets

.github/workflows/release.yml

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+name: Release
+on:
+  push:
+    branches:
+      - master
+jobs:
+  release:
+    name: Release
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout Repo
+        uses: actions/checkout@v2
+        with:
+          # This makes Actions fetch all Git history so that Changesets can generate changelogs with the correct commits
+          fetch-depth: 0
+
+      # gallium is the v16 lts
+      - name: Setup Node.js lts/gallium
+        uses: actions/setup-node@v2
+        with:
+          node-version: lts/gallium
+
+      - name: Install Dependencies
+        run: npm i
+
+      - name: Create Release Pull Request or Publish to npm
+        id: changesets
+        uses: changesets/action@v1
+        with:
+          # This expects you to have a script called release which does a build for your packages and calls changeset publish
+          publish: npm run release
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          NPM_TOKEN: ${{ secrets.NPM_TOKEN }}