CI: Ensure builds are triggered weekly

[mgxd]

No description provided.

[effigies]

Is this to keep the cache from expiring? If not, maybe we should drop cache so we're not surprised by mismatches between master and PRs?

[mgxd]

is there an easy way to specify a stale cache on GHA? I agree dropping the cache can be helpful (just came up in #269) but might be excessive doing it every build

[codecov-commenter]

Codecov Report

Base: 83.94% // Head: 90.74% // Increases project coverage by +6.80% 🎉

Coverage data is based on head (b49f5e7) compared to base (07ee004).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #270      +/-   ##
==========================================
+ Coverage   83.94%   90.74%   +6.80%     
==========================================
  Files          24       24              
  Lines        1999     1999              
  Branches      232      304      +72     
==========================================
+ Hits         1678     1814     +136     
+ Misses        280      145     -135     
+ Partials       41       40       -1     

Flag	Coverage Δ
travis	83.94% <ø> (ø)
unittests	90.74% <ø> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
sdcflows/workflows/outputs.py	93.84% <0.00%> (+1.53%)	⬆️
sdcflows/interfaces/reportlets.py	89.83% <0.00%> (+1.69%)	⬆️
sdcflows/interfaces/bspline.py	80.64% <0.00%> (+3.22%)	⬆️
sdcflows/interfaces/utils.py	90.86% <0.00%> (+10.04%)	⬆️
sdcflows/workflows/fit/syn.py	69.82% <0.00%> (+21.30%)	⬆️
sdcflows/interfaces/fmap.py	96.55% <0.00%> (+24.13%)	⬆️
sdcflows/utils/phasemanip.py	94.02% <0.00%> (+28.35%)	⬆️
sdcflows/interfaces/brainmask.py	100.00% <0.00%> (+43.75%)	⬆️

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[effigies]

My guess would be adding something that changes periodically to the cache name, like ${{ date.week }} (I just made that up).

[effigies]

Well, we can worry about better cache names later. Sorry for dropping the ball on this one, which is clearly a good idea on its own.