switch Docker CI cron to weekly, explicit dependency on HB #61
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We've started hitting Docker pull rate limits here:
Since fourcolor is already tested in MathComp's CI using Nix, this PR restricts the recurring Docker cron CI to once per week. This should reduce the number of Docker pulls so we don't hit the limit.
At the same time, I explicitly record Hierarchy Builder as a dependency, since there are plenty of
From HB Require Import structures
in the code, and adjust some opam boundaries to require less maintenance.