Merge pull request #192 from mainmatter/ci-schedule

chore(ci): re-create book artifacts at the beginning of each month

.github/workflows/ci.yml

@@ -7,6 +7,10 @@ on:
   pull_request:
     branches:
       - main
+  workflow_dispatch:
+  schedule:
+    # First day of a month
+    - cron: '0 0 1 * *'
 
 jobs:
   build: