makefile: add make jen

[arajasek]

No description provided.

[codecov]

Codecov Report

Merging #8122 (355b738) into master (f17bbc9) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #8122      +/-   ##
==========================================
- Coverage   39.37%   39.35%   -0.02%     
==========================================
  Files         666      666              
  Lines       72460    72460              
==========================================
- Hits        28534    28520      -14     
- Misses      38999    39012      +13     
- Partials     4927     4928       +1     

Impacted Files	Coverage Δ
chain/rand/rand.go	61.90% <0.00%> (-5.72%)	⬇️
chain/types/blockheader.go	55.55% <0.00%> (-2.23%)	⬇️
extern/sector-storage/stores/local.go	59.16% <0.00%> (-0.84%)	⬇️
extern/sector-storage/sched.go	84.77% <0.00%> (-0.83%)	⬇️
chain/store/store.go	63.00% <0.00%> (-0.67%)	⬇️
storage/wdpost_run.go	69.79% <0.00%> (-0.41%)	⬇️
chain/messagepool/selection.go	83.91% <0.00%> (-0.39%)	⬇️
chain/actors/builtin/miner/v7.go	52.90% <0.00%> (-0.31%)	⬇️
chain/messagepool/messagepool.go	63.76% <0.00%> (-0.25%)	⬇️
chain/exchange/peer_tracker.go	66.66% <0.00%> (ø)
... and 4 more

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[ribasushi]

LGTM

[ZenGround0]

LGTM

[ZenGround0]

Important work

[whyrusleeping]

LGTM