fix(upload): prevent overlapping cron runs

scripts/process-scheduled-video-uploads.sh

@@ -0,0 +1,18 @@
+#!/bin/sh
+set -eu
+
+upload_cron_lock=/tmp/erika-video-upload-cron.lock
+
+if ! mkdir "$upload_cron_lock" 2>/dev/null; then
+  echo "Previous scheduled video upload run is still active; skipping this minute."
+  exit 0
+fi
+
+trap 'rmdir "$upload_cron_lock"' EXIT INT TERM
+
+wget -q -O /dev/null \
+  --header="Authorization: Bearer ${CRON_SECRET}" \
+  http://app:3000/api/cron/video-uploads || {
+    echo "Scheduled video upload processing failed." >&2
+    exit 1
+  }

scripts/video-upload-crontab

@@ -1 +1 @@
-* * * * * wget -q -O /dev/null --header="Authorization: Bearer ${CRON_SECRET}" http://app:3000/api/cron/video-uploads || echo "Scheduled video upload processing failed." >&2
+* * * * * /usr/local/bin/process-scheduled-video-uploads