ci: add linter, update pr template, variety of cleanups

[smsunarto]

Closes: #XXX

What is the purpose of the change

Add a description of the overall background and high-level changes that this PR introduces

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• The metadata is stored in the blob store on job creation time as a persistent artifact
• Deployments RPC transmits only the blob storage reference
• Daemons retrieve the RPC data from the blob cache

Testing and Verifying

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This change is a trivial rework/code cleanup without any test coverage.

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This change is already covered by existing tests, such as (please describe tests).

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This change added tests and can be verified as follows:

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[smsunarto]

• ci: add linter, update pr template, variety of cleanups #47 👈
• main

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[codecov]

Codecov Report

Attention: Patch coverage is 64.83516% with 32 lines in your changes are missing coverage. Please review.

Project coverage is 50.72%. Comparing base (f7430a0) to head (a6781d2).

Files	Patch %	Lines
common/teacmd/docker.go	0.00%	10 Missing ⚠️
common/teacmd/git.go	30.76%	9 Missing ⚠️
cmd/world/root/create.go	81.48%	4 Missing and 1 partial ⚠️
common/config/config.go	66.66%	4 Missing and 1 partial ⚠️
cmd/world/root/doctor.go	90.90%	1 Missing and 1 partial ⚠️
cmd/world/root/version.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #47      +/-   ##
==========================================
+ Coverage   48.73%   50.72%   +1.99%     
==========================================
  Files           8        8              
  Lines         515      412     -103     
==========================================
- Hits          251      209      -42     
+ Misses        241      179      -62     
- Partials       23       24       +1     

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