Revert appimage removal

[coryschwartz]

this reverts two commits that were used to remove the appimage from release bundles.

6b08680
7d65a26

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Before you mark the PR ready for review, please make sure that:

• All commits have a clear commit message.
• The PR title is in the form of of <PR type>: <area>: <change being made>
  • example: fix: mempool: Introduce a cache for valid signatures
  • PR type: fix, feat, INTERFACE BREAKING CHANGE, CONSENSUS BREAKING, build, chore, ci, docs,perf, refactor, revert, style, test
  • area: api, chain, state, vm, data transfer, market, mempool, message, block production, multisig, networking, paychan, proving, sealing, wallet, deps
• This PR has tests for new functionality or change in behaviour
• If new user-facing features are introduced, clear usage guidelines and / or documentation updates should be included in https://lotus.filecoin.io or Discussion Tutorials.
• CI is green

[codecov]

Codecov Report

Merging #8439 (c715254) into master (0fa74a7) will decrease coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #8439      +/-   ##
==========================================
- Coverage   40.66%   40.61%   -0.05%     
==========================================
  Files         686      686              
  Lines       75398    75398              
==========================================
- Hits        30661    30624      -37     
- Misses      39443    39467      +24     
- Partials     5294     5307      +13     

Impacted Files	Coverage Δ
chain/events/message_cache.go	87.50% <0.00%> (-12.50%)	⬇️
chain/events/observer.go	71.64% <0.00%> (-8.21%)	⬇️
storage/wdpost_sched.go	81.37% <0.00%> (-5.89%)	⬇️
miner/miner.go	56.06% <0.00%> (-3.94%)	⬇️
chain/events/events_called.go	85.36% <0.00%> (-1.96%)	⬇️
chain/store/store.go	64.33% <0.00%> (-1.50%)	⬇️
storage/wdpost_changehandler.go	98.11% <0.00%> (-1.42%)	⬇️
chain/gen/gen.go	68.19% <0.00%> (-1.23%)	⬇️
extern/sector-storage/sched_worker.go	78.82% <0.00%> (-1.18%)	⬇️
extern/sector-storage/sched.go	84.77% <0.00%> (-0.83%)	⬇️
... and 12 more

[arajasek]

Yay!