Make backup_appdata work if container needs file binds #199
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In rare cases a container image requires binding a file directly, which the script takes as source_dir for the backup. This adds a check, if the directory the scripts grabs is a filename and strips the filename.
i.e.
./backup_appdata.sh: line 185: cd: /appdata/container/container.conf/..: Not a directory
This PR fixes this and stripes the filename (container.conf), so the script backups /appdata/container/ and its content properly.