feat: Add a nightly build

Added a scheduled nightly build workflow to keep the deployed site current
with any content changes, particularly in the private submodule.

.forgejo/workflows/deploy.yaml

@@ -5,6 +5,8 @@ on:
     branches:
       - master
       - develop
+  schedule:
+    - cron: '0 2 * * *'
 
 jobs:
   deploy:

deploy.sh

@@ -15,10 +15,6 @@ fi
 CMD=$1
 
 case $CMD in
-    sync)
-        rsync -avz src/ /var/lib/www/
-        ;;
-
     build)
         printf "Building blog with mdbook...\n"
         [ -s src ] || ln -s /var/lib/www src