Revert "refactor: remove caddy installation from multiple app install scripts"

This reverts commit 4b4d04ed3d.

jellyfin/install.sh

@@ -19,6 +19,7 @@ fi
 JELLYFIN_DIR="${APP_DIR}/${APP_NAME}"
 COMPOSE_FILE="${JELLYFIN_DIR}/docker-compose.yml"
 
+apt-get install -y caddy
 mkdir -p "${JELLYFIN_DIR}"
 mkdir -p /srv/media/movies /srv/media/shows /srv/media/music