This update for charliecloud fixes the following issues:

charliecloud was updated to version 0.11:

- ch-run: /etc/resolv.conf on the host is now optional
- ch-grow: support ARG instruction
- build now does not infinite loop if no Python installed
- miscellaneous bug fixes, and documentation and test suite
improvements

Update to version 0.10:

- New builder ch-grow
- ch-build includes option --builder
- ch-docker2tar renamed to ch-builder2tar
- new quashFS wrapper scripts: ch-docker2squash, ch-docker2squash, ch-tar2squash, ch-mount and ch-umount
- new namespace tester ch-checkns
- Full changelog at https://groups.io/g/charliecloud/message/96

Update to version 0.9.10:

- Documentation and examples: misc improvements.
- Full changelog at https://groups.io/g/charliecloud/message/88

Update to version 0.9.9:

- Bugfixes and documentation improvements.
- Full changelog at https://groups.io/g/charliecloud/message/87