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Improve support for docker machine

Kamil Trzciński (Back 2025-01-01) requested to merge fix-docker-machine into master

This adds a few improvements to docker machine support:

  • increases the UsedCount at a time that machine is used instead of doing that when releasing,
  • remove machine when releasing if it UsedCount is over MaxBuilds,
  • look for free machines in reverse order, this is to increase a change of using the newest created machine and increasing the probability of removing over idle ones - previously we were using machines from the oldest created, thus always going over IdleCount due to IdleTime,
  • put a timestamp in a few places for docker-machine,
  • set UsedCount to 1 to mark a machines as dirty on start, otherwise if you restart runner, the runner will run build on already dirty machines (especially important if you have MaxBuilds = 1).

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