Dry run only

[gergness]

Pull out the dry run part out of #555 so we can merge it without the multi-file support

And add handling of async validation errors and encoding specification

[codecov]

Codecov Report

Merging #566 (3c0b1d4) into master (f828924) will increase coverage by 0.02%.
The diff coverage is 100.00%.

❗ Current head 3c0b1d4 differs from pull request most recent head ca45c6f. Consider uploading reports for the commit ca45c6f to get more accurate results

@@            Coverage Diff             @@
##           master     #566      +/-   ##
==========================================
+ Coverage   90.59%   90.62%   +0.02%     
==========================================
  Files         128      128              
  Lines        8167     8179      +12     
==========================================
+ Hits         7399     7412      +13     
+ Misses        768      767       -1     

Impacted Files	Coverage Δ
R/api.R	93.02% <100.00%> (+0.16%)	⬆️
R/automation.R	94.04% <100.00%> (+1.83%)	⬆️
R/progress.R	100.00% <100.00%> (ø)

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[malecki]

makes sense