docs: add example CI job

README.md

@@ -20,8 +20,34 @@ shipit
 In order to be able to authenticate with Github, you must set an environment
 variable called `GITHUB_TOKEN` to a
 [personal access token](https://docs.github.com/en/authentication/keeping-your-account-and-data-secure/creating-a-personal-access-token)
-with `repo` permissions. This must also be done when running in a CI
-environment.
+with `repo` permissions.
+
+If you'd prefer to run `shipit` on CI, you can:
+
+```yaml
+on:
+  push:
+    branches:
+      - main
+
+  release:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+
+      - uses: denoland/setup-deno@v1
+        with:
+          deno-version: vx.x.x
+
+      - run: deno run --allow-net --allow-env --allow-run https://deno.land/x/shipit/shipit.ts
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+```
+
+Be sure to provide `GITHUB_TOKEN` as an environment variable to the `shipit`
+script, as well as set `fetch-depth: 0` in the checkout step.
 
 ## Granting permissions