Support attachments starting with a dot

Ex: .config from https://bugs.archlinux.org/task/3786

snapshotter.sh

 #!/bin/bash
 set -o nounset -o errexit -o pipefail
+shopt -s dotglob # Needed for attachments starting with a dot
 ALBS_PARALLELIZE_DOWNLOAD="${ALBS_PARALLELIZE_DOWNLOAD:-false}"
 ALBS_DOWNLOAD_WAIT="${ALBS_DOWNLOAD_WAIT:-0.05}"
 ALBS_RANGE_DOWNLOAD_ENABLED="${ALBS_RANGE_DOWNLOAD_ENABLED:-false}"
@@ -81,7 +82,8 @@ function download_attachment() {
        --user-agent="${user_agent}" \
        --no-verbose \
        "https://bugs.archlinux.org/?getfile=${2}"
-  filename="$(compgen -G "*")"
+  local files=(*)
+  filename="${files[0]}"
 
   cd ..
   mv "tmp/${filename}" .