feat(output): add wrapper and failed conversion handling

output/Docker/entrypoint.sh

@@ -0,0 +1,18 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+PUID=${PUID:-1000}
+PGID=${PGID:-1000}
+
+if ! command -v gosu >/dev/null 2>&1; then
+  echo "gosu is required but not installed" >&2
+  exit 1
+fi
+
+if [ -d /data ]; then
+  chown -R "${PUID}:${PGID}" /data
+fi
+
+export HOME=${HOME:-/tmp}
+
+exec gosu "${PUID}:${PGID}" python3 /app/watch_and_convert.py