feat: ci: packer snap

[coryschwartz]

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• The PR title is in the form of of <PR type>: <#issue number> <area>: <change being made>
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[coryschwartz]

This changes the snap package so it can be used on digitalocean as a service

The snap package will install a service rather than just commandline tools, meaning lotus daemon is running in the background, enabled at boot.

commandline tools for the miner, worker, and lotus are of course installed as part of the snap. The lotus commandline is configured to interact with the local daemon by default, and can be made to use another daemon or gateway with environment variables, as usual.

Included in this PR is a change to the digitalocean image, this will make a digitalocean image install the snap package rather than copying the lotus binaries. This way, we do not need to update the digitalocean image when there are new releases. Simply by updating the snap package, the digitalocean images will start using the updated snap.

[coryschwartz]

If you'd like to try out the images created with this change, see lotus-mainnet-snap-20220119015458 in the DO account.

[coryschwartz]

Sorry for the delay, should be good to go now.

[codecov]

Codecov Report

Merging #7819 (cdd2d5c) into master (9429229) will decrease coverage by 0.06%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #7819      +/-   ##
==========================================
- Coverage   39.48%   39.42%   -0.07%     
==========================================
  Files         666      666              
  Lines       72498    72498              
==========================================
- Hits        28627    28583      -44     
- Misses      38915    38948      +33     
- Partials     4956     4967      +11     

Impacted Files	Coverage Δ
cli/util.go	41.66% <0.00%> (-8.34%)	⬇️
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/stmgr/searchwait.go	67.30% <0.00%> (-2.57%)	⬇️
extern/sector-storage/sched.go	83.12% <0.00%> (-2.47%)	⬇️
storage/wdpost_sched.go	75.49% <0.00%> (-1.97%)	⬇️
chain/exchange/client.go	52.96% <0.00%> (-1.70%)	⬇️
miner/miner.go	56.72% <0.00%> (-1.32%)	⬇️
extern/storage-sealing/fsm.go	56.44% <0.00%> (-1.05%)	⬇️
... and 12 more

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