Disable appimage

[travisperson]

It appears recently something has changed in circleci and we no longer have access to the /dev/snd device which is causing the appimage tests to fail during setup.

[magik6k]

Should modify template.yml, so that the gen-check doesn't complain.

[codecov]

Codecov Report

Merging #7707 (66c8c66) into master (0cfc344) will decrease coverage by 0.05%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #7707      +/-   ##
==========================================
- Coverage   39.59%   39.54%   -0.06%     
==========================================
  Files         640      640              
  Lines       68326    68326              
==========================================
- Hits        27056    27018      -38     
- Misses      36631    36655      +24     
- Partials     4639     4653      +14     

Impacted Files	Coverage Δ
extern/sector-storage/worker_tracked.go	76.53% <0.00%> (-8.17%)	⬇️
chain/rand/rand.go	57.89% <0.00%> (-6.32%)	⬇️
markets/retrievaladapter/client_blockstore.go	62.50% <0.00%> (-6.25%)	⬇️
chain/stmgr/call.go	67.87% <0.00%> (-3.64%)	⬇️
chain/types/tipset_key.go	85.96% <0.00%> (-3.51%)	⬇️
chain/sub/incoming.go	54.43% <0.00%> (-3.38%)	⬇️
chain/types/blockheader.go	55.55% <0.00%> (-2.23%)	⬇️
extern/sector-storage/sched_worker.go	78.48% <0.00%> (-1.17%)	⬇️
miner/miner.go	56.95% <0.00%> (-0.67%)	⬇️
storage/wdpost_run.go	69.62% <0.00%> (-0.43%)	⬇️
... and 7 more

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