Restore Sauce Labs browser tests

Reusing the abstract-leveldown account for now.

.airtap.yml

@@ -1,6 +1,5 @@
 providers:
   - airtap-sauce
-  - airtap-default
 
 browsers:
   - name: chrome

.github/workflows/sauce.yml

@@ -0,0 +1,29 @@
+name: Sauce Labs
+on: push
+permissions:
+  contents: read
+concurrency: sauce-labs
+jobs:
+  test:
+    name: Test
+    if: ${{ github.actor != 'dependabot[bot]' }}
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Set up node
+        uses: actions/setup-node@v3
+        with:
+          node-version: 16
+      - name: Install
+        run: npm install
+        env:
+          # Download Sauce Connect binary now instead of on first run
+          SAUCE_CONNECT_DOWNLOAD_ON_INSTALL: true
+      - name: Add host
+        run: echo "127.0.0.1 airtap.local" | sudo tee -a /etc/hosts
+      - name: Test
+        run: npm run test-browsers
+        env:
+          SAUCE_USERNAME: ${{ secrets.SAUCE_USERNAME }}
+          SAUCE_ACCESS_KEY: ${{ secrets.SAUCE_ACCESS_KEY }}

README.md

@@ -189,13 +189,9 @@ const xyz = db.sublevel<string, any>('xyz', { valueEncoding: 'json' })
 
 ## Supported Platforms
 
-We aim to support Active LTS and Current Node.js releases as well as browsers. Supported runtime environments may differ per implementation.
-
-<!--
-As far as `abstract-level` goes, the following browsers are supported and continuously tested.
+We aim to support Active LTS and Current Node.js releases as well as browsers. Supported runtime environments may differ per implementation. As far as `abstract-level` goes, the following browsers are supported and continuously tested.
 
 [![Sauce Test Status](https://app.saucelabs.com/browser-matrix/abstract-leveldown.svg)](https://app.saucelabs.com/u/abstract-leveldown)
--->
 
 ## Public API For Consumers
 
@@ -1402,13 +1398,11 @@ npm install abstract-level
 
 See the [Contribution Guide](https://github.com/Level/community/blob/master/CONTRIBUTING.md) for more details.
 
-<!--
 ## Big Thanks
 
 Cross-browser Testing Platform and Open Source ♥ Provided by [Sauce Labs](https://saucelabs.com).
 
 [![Sauce Labs logo](./sauce-labs.svg)](https://saucelabs.com)
--->
 
 ## Donate