20240504 - Docker version upgrade

This comes to you by way of @zanetaylor, who contributed #8 to update the Docker version to the oldest server version that supports the minimum API version supported by the current Docker release (v26), which is API v1.24. Thanks, Zane!

20240219

Yes, this repo is still alive, and I still think about it!

Today I pushed up a couple minor changes to the code, and cut a new release mostly as a way of getting container image versions into place that aren't latest. Good practices are good.

The code changes in this release are mostly trivial:

1. Bumped the parent image from Alpine 3.13 to 3.19.
2. Made the default cron execution consistent with the documentation (0 0 * * *).
3. Fixed a cosmetic bug where an sh: out of range message was get emitted if CLEAN_UP_VOLUMES was unset.
4. Tightened up the script syntax a little.

Probably the most important change is that container image tagging is a more consistent thing now:

• The new image version: clockworksoul/docker-gc-cron:20240219
• The previous image version (from 2021): clockworksoul/docker-gc-cron:20210727

As usual, please let me know if you see any issues!

Full Changelog: 2021072...2024021