Add basic CI Release Documentation

[ziyiwu9494]

Readme and template for documenting how to create a new CI file for releases. Right now the process must be done manually.

[ryanjulian]

Can you put these docs into ReadTheDocs (in docs/) instead?

[ryanjulian]

I don't think this is the best place for this file, since it will probably get picked up by GH actions. Is this just a copy (mostly) of the existing release files? In that case, not sure we need it.

[ziyiwu9494]

Hi! I'm reopening this because I don't think we'll be changing the Github Actions workflows any further for some time. The template is closer to a copy of the Release CI but with updates (doctest, etc.). I feel like it would just make the process more foolproof than it would be if there was no file at all that could be made into a new release ci file with the obvious edits. It does fail GH actions though. Do you think there's a better place to put it?

[codecov]

Codecov Report

Merging #2232 (942566a) into master (7ecab12) will decrease coverage by 0.66%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2232      +/-   ##
==========================================
- Coverage   91.84%   91.18%   -0.67%     
==========================================
  Files         242      201      -41     
  Lines       17456    10977    -6479     
  Branches     2537     1371    -1166     
==========================================
- Hits        16033    10009    -6024     
+ Misses       1057      705     -352     
+ Partials      366      263     -103     

Impacted Files	Coverage Δ
src/garage/sampler/utils.py	0.00% <0.00%> (-77.05%)	⬇️
src/garage/torch/algos/pearl.py	48.64% <0.00%> (-31.00%)	⬇️
src/garage/envs/multi_env_wrapper.py	79.51% <0.00%> (-14.60%)	⬇️
src/garage/tf/policies/policy.py	77.77% <0.00%> (-13.53%)	⬇️
src/garage/sampler/env_update.py	82.92% <0.00%> (-13.08%)	⬇️
src/garage/tf/algos/erwr.py	44.44% <0.00%> (-12.70%)	⬇️
src/garage/experiment/task_sampler.py	75.86% <0.00%> (-7.58%)	⬇️
src/garage/np/_functions.py	77.39% <0.00%> (-7.01%)	⬇️
...rage/tf/optimizers/conjugate_gradient_optimizer.py	81.90% <0.00%> (-6.57%)	⬇️
src/garage/tf/_functions.py	68.85% <0.00%> (-5.98%)	⬇️
... and 150 more

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