Add changesets publication workflow

That dependency graph is absurd. I've at least significantly tamped it
down using nolyfill.

.changeset/config.json

@@ -0,0 +1,11 @@
+{
+  "$schema": "https://unpkg.com/@changesets/config@2.3.1/schema.json",
+  "changelog": "@changesets/cli/changelog",
+  "commit": false,
+  "fixed": [],
+  "linked": [],
+  "access": "restricted",
+  "baseBranch": "master",
+  "updateInternalDependencies": "patch",
+  "ignore": []
+}

.github/workflows/ci.yml

@@ -16,7 +16,7 @@ jobs:
       - run: npm run lint
       - run: npm run test
       - run: npm run build
-  deploy:
+  deploy-demo:
     # Only run on master commits; this is a further restriction of the top-level `on`.
     if: github.event_name == 'push'
     needs: build-lint-test
@@ -30,3 +30,28 @@ jobs:
       - uses: actions/checkout@v3
       - uses: superfly/flyctl-actions/setup-flyctl@master
       - run: flyctl deploy --remote-only --config demo/fly.${{ matrix.service }}.toml --ignorefile demo/Dockerfile.${{ matrix.service }}.dockerignore
+  release:
+    # Only run on master commits; this is a further restriction of the top-level `on`.
+    if: github.event_name == 'push'
+    needs: build-lint-test
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write # to create releases
+      pull-requests: write # to create pull requests
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          # Changesets needs full history to create proper changelogs.
+          fetch-depth: 0
+      - uses: actions/setup-node@v3
+        with:
+          node-version: 20.x
+      - run: npm install
+      - uses: changesets/action@v1
+        with:
+          commit: Version neogrok
+          title: Version neogrok
+          publish: npx changeset publish
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          NPM_TOKEN: ${{ secrets.NPM_TOKEN }}