feat: add internal WordPress cron runner

wp-cli/cron.sh

@@ -0,0 +1,36 @@
+#!/bin/sh
+set -eu
+
+cd /var/www/html
+
+trap 'exit 0' INT TERM
+
+interval="${WP_CRON_INTERVAL_SECONDS:-300}"
+case "$interval" in
+    "" | *[!0-9]*)
+        echo "WP_CRON_INTERVAL_SECONDS must be a positive integer." >&2
+        exit 1
+        ;;
+esac
+
+if [ "$interval" -lt 60 ]; then
+    echo "WP_CRON_INTERVAL_SECONDS must be at least 60 seconds." >&2
+    exit 1
+fi
+
+while [ ! -f /var/www/html/wp-load.php ]; do
+    sleep 10
+done
+
+until wp core is-installed >/dev/null 2>&1; do
+    sleep 10
+done
+
+while :; do
+    if ! wp cron event run --due-now >/dev/null 2>&1; then
+        echo "Warning: failed to run due WordPress cron events." >&2
+    fi
+
+    sleep "$interval" &
+    wait "$!"
+done