add lotus-seed to Dockerfile

[nonsense]

This PR is adding lotus-seed to the lotus-all-in-one, so that we can easily create devnets.

[codecov]

Codecov Report

Merging #7643 (75138e5) into master (ef0771e) will decrease coverage by 0.07%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #7643      +/-   ##
==========================================
- Coverage   39.77%   39.70%   -0.08%     
==========================================
  Files         633      633              
  Lines       67263    67263              
==========================================
- Hits        26757    26708      -49     
- Misses      35911    35952      +41     
- Partials     4595     4603       +8     

Impacted Files	Coverage Δ
chain/events/message_cache.go	87.50% <0.00%> (-12.50%)	⬇️
storage/wdpost_sched.go	75.49% <0.00%> (-11.77%)	⬇️
extern/sector-storage/worker_tracked.go	76.53% <0.00%> (-8.17%)	⬇️
chain/events/observer.go	71.64% <0.00%> (-6.72%)	⬇️
chain/stmgr/execute.go	86.95% <0.00%> (-4.35%)	⬇️
chain/exchange/peer_tracker.go	66.66% <0.00%> (-4.31%)	⬇️
chain/stmgr/call.go	71.51% <0.00%> (-3.64%)	⬇️
extern/sector-storage/stores/local.go	57.30% <0.00%> (-1.97%)	⬇️
chain/events/events_called.go	83.90% <0.00%> (-1.96%)	⬇️
storage/wdpost_changehandler.go	97.64% <0.00%> (-1.89%)	⬇️
... and 15 more

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[magik6k]

(conflicts)

[nonsense]

@magik6k I am holding off on this one, as we really want the debug version of binaries for development purposes, and not sure it makes sense to add lotus-seed with mainnet version of binaries to the docker image.

[nonsense]

Superseded by #7956