[Bug 1778256] Re: [Pull request] Move apt-btrfs-snapshot to daily systemd timers, drop python2 and other changes

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https://bugs.launchpad.net/bugs/1778256

Title:
  [Pull request] Move apt-btrfs-snapshot to daily systemd timers, drop
  python2 and other changes

Status in apt-btrfs-snapshot package in Ubuntu:
  New

Bug description:
  Hello, 
  I have created a fork of apt-btrfs-snapshot for my own usage and want to propose these changes for upstream. 

  The code is here: https://gitlab.com/mikhailnov/apt-btrfs-snapshot
  Please have a look at it. Unfortunately, I have not understood how to
  send a pull request at Launchpad.

  Changes compared to the upstream version 3.5.1:

  * Systemd daily timer instead of weekly cron to clean old snapshots
  * Do not run the timer when on battery (with no AC power)
  * Force btrfs sync after snapshot deletions
  * Introduce etc/apt-btrfs-snapshot.conf.d/ directory for config files which are loaded in alpha-numerical order
  * /etc/apt-btrfs-snapshot.conf.d/10-default.conf is the default config, but other packages may put other configs into the config directory (for example, I want to override MaxAge on a group of machines and package my own config file /etc/apt-btrfs-snapshot.conf.d/20-my.conf); I will probably add such config to [system-autoupdate](https://gitlab.com/mikhailnov/system-autoupdate) 
  * Default MageAge to 15 days (2 weeks + 1 day) instead of 90 days to reduce problems with no empty space left on disk
  * Drop support for building with python2

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