Set up 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@1.6.3/schema.json",
+  "changelog": ["@changesets/changelog-github", {"repo": "primer/behaviors"}],
+  "commit": false,
+  "linked": [],
+  "access": "public",
+  "baseBranch": "main",
+  "updateInternalDependencies": "patch",
+  "ignore": []
+}

.changeset/great-impalas-join.md

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+---
+'@primer/behaviors': patch
+---
+
+Set up changesets

.github/workflows/check_for_changeset.yml

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+name: Check for changeset
+
+on:
+  pull_request:
+    types:
+      # On by default if you specify no types.
+      - "opened"
+      - "reopened"
+      - "synchronize"
+      # For `skip-label` only.
+      - "labeled"
+      - "unlabeled"
+
+jobs:
+  check-for-changeset:
+    name: Check for changeset
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: "Check for changeset"
+        uses: brettcannon/check-for-changed-files@v1
+        with:
+          file-pattern: ".changeset/*.md"
+          skip-label: "skip changeset"
+          failure-message: "No changeset found. If these changes should not result in a new version, apply the ${skip-label} label to this pull request. If these changes should result in a version bump, please add a changeset https://git.io/J6QvQ"

.github/workflows/release.yml

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+name: Release
+on:
+  push:
+    branches:
+      - main
+jobs:
+  release:
+    name: Release
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        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
+          persist-credentials: false
+
+      - name: Set up Node.js
+        uses: actions/setup-node@v2
+        with:
+          node-version: 16
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Create release pull request or publish to npm
+        id: changesets
+        uses: changesets/action@master
+        with:
+          title: Release Tracking
+          # 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.GPR_AUTH_TOKEN_SHARED }}
+          NPM_TOKEN: ${{ secrets.NPM_AUTH_TOKEN_SHARED }}

.github/workflows/release_canary.yml

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+name: Release
+on:
+  push:
+    branches-ignore:
+      - 'main'
+      - 'changeset-release/main'
+    # To avoid unnecessary noise, we don't create canary releases when these paths change:
+    paths-ignore:
+      - '.changeset/**'
+      - '.devcontainer/**'
+      - '.github/**'
+      - '.storybook/**'
+      - '.vscode/**'
+      - 'docs/**'
+
+jobs:
+  release-canary:
+    name: Canary
+    if: ${{ github.repository == 'primer/behaviors' }}
+
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+        with:
+          # This makes Actions fetch all Git history so that Changesets can generate changelogs with the correct commits
+          fetch-depth: 0
+
+      - name: Set up Node.js
+        uses: actions/setup-node@v2
+        with:
+          node-version: 16
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Build
+        run: npm run build
+
+      - name: Create .npmrc
+        run: |
+          cat << EOF > "$HOME/.npmrc"
+            //registry.npmjs.org/:_authToken=$NPM_TOKEN
+          EOF
+        env:
+          NPM_TOKEN: ${{ secrets.NPM_AUTH_TOKEN_SHARED }}
+
+      - name: Publish canary version
+        run: |
+          echo "$( jq '.version = "0.0.0"' package.json )" > package.json
+          echo -e "---\n'@primer/behaviors': patch\n---\n\nFake entry to force publishing" > .changeset/force-snapshot-release.md
+          yarn changeset version --snapshot
+          yarn changeset publish --tag canary
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Output canary version number
+        uses: actions/github-script@v4.0.2
+        with:
+          script: |
+            const package = require(`${process.env.GITHUB_WORKSPACE}/package.json`)
+            github.repos.createCommitStatus({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              sha: context.sha,
+              state: 'success',
+              context: `Published ${package.name}`,
+              description: package.version,
+              target_url: `https://unpkg.com/${package.name}@${package.version}/`
+            })

.github/workflows/release_candidate.yml

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+name: Release
+on:
+  push:
+    branches:
+      - 'changeset-release/main'
+
+jobs:
+  release-candidate:
+    name: Candidate
+    if: ${{ github.repository == 'primer/behaviors' }}
+
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+        with:
+          # This makes Actions fetch all Git history so that Changesets can generate changelogs with the correct commits
+          fetch-depth: 0
+
+      - name: Set up Node.js
+        uses: actions/setup-node@v2
+        with:
+          node-version: 16
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Build
+        run: npm run build
+
+      - name: Create .npmrc
+        run: |
+          cat << EOF > "$HOME/.npmrc"
+            //registry.npmjs.org/:_authToken=$NPM_TOKEN
+          EOF
+        env:
+          NPM_TOKEN: ${{ secrets.NPM_AUTH_TOKEN_SHARED }}
+
+      - name: Publish release candidate
+        run: |
+          version=$(jq -r .version package.json)
+          echo "$( jq ".version = \"$(echo $version)-rc.$(git rev-parse --short HEAD)\"" package.json )" > package.json
+          yarn publish --tag next
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Output release candidate version number
+        uses: actions/github-script@v4.0.2
+        with:
+          script: |
+            const package = require(`${process.env.GITHUB_WORKSPACE}/package.json`)
+            github.repos.createCommitStatus({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              sha: context.sha,
+              state: 'success',
+              context: `Published ${package.name}`,
+              description: package.version,
+              target_url: `https://unpkg.com/${package.name}@${package.version}/`
+            })