Clone mirror from drone
With the re-installation of the drone instance [1], I had to setup a new mirror but our setup needed to patch mercurial [2]. So instead I tried to follow the suggestion to use share.pool.
I created a branch for plugins/hg [3] which allow to define a share.pool if HG_SHARE_POOL is set.
I propose to change all .drone.yaml to mount a mercurial pool volume.
[1] https://discuss.tryton.org/t/lost-of-tycho-drone-backup-and-windows-virtual-machines/1935
[2] https://www.mercurial-scm.org/pipermail/mercurial/2018-July/050944.html
[3] https://github.com/cedk/drone-hg/tree/share-pool