Create release workflow using changesets

.changeset/README.md

@@ -0,0 +1,8 @@
+# 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/master/docs/common-questions.md)

.changeset/config.json

@@ -0,0 +1,10 @@
+{
+  "$schema": "https://unpkg.com/@changesets/config@1.5.0/schema.json",
+  "changelog": "@changesets/cli/changelog",
+  "commit": false,
+  "linked": [],
+  "access": "public",
+  "baseBranch": "master",
+  "updateInternalDependencies": "patch",
+  "ignore": []
+}

.changeset/cyan-squids-camp.md

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+---
+'@primer/css': patch
+---
+
+Adding changesets to release workflow

.github/workflows/ci.yml

@@ -19,7 +19,3 @@ jobs:
       - name: test deprecations
         if: startsWith(github.ref, 'refs/heads/release-')
         run: script/test-deprecations.js
-      - uses: primer/publish@v1.1.0
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-          NPM_AUTH_TOKEN: ${{ secrets.NPM_AUTH_TOKEN }}

.github/workflows/publish.yml

@@ -0,0 +1,40 @@
+name: Primer CSS
+on: [push]
+jobs:
+  ci:
+    name: CI
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repo
+        uses: actions/checkout@master
+
+      - name: Set up Node.js 10.x
+        uses: actions/setup-node@master
+        with:
+          node-version: 10
+
+      - name: Install dependencies
+        run: yarn
+
+      - name: Create .npmrc
+        run: |
+          cat << EOF > "$HOME/.npmrc"
+            //registry.npmjs.org/:_authToken=$NPM_TOKEN
+          EOF
+        env:
+          NPM_TOKEN: ${{ secrets.NPM_AUTH_TOKEN_SHARED }}
+
+      - name: Release snapshot
+        run: |
+          yarn changeset version --snapshot
+          yarn changeset publish --tag canary
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Find version
+        run: |
+          name=$(jq -r .name package.json)
+          version=$(jq -r .version package.json)
+          npx action-status --context="$name" --state=success --description=$version --url "https://unpkg.com/$name@$version/"
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}