Adding check to main and cran versions of epiworldRShiny

[gvegayon]

• Adds R CMD check for the CRAN and GitHub@main versions of epiworldRShiny.
• Adds a work around to avoid breaking epiworldRShiny on CRAN.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 40 lines in your changes missing coverage. Please review.

Project coverage is 19.14%. Comparing base (8bd6b18) to head (d2a7d03).

Files with missing lines	Patch %	Lines
R/tool.R	0.00%	21 Missing ⚠️
R/virus.R	0.00%	19 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #21      +/-   ##
==========================================
- Coverage   19.54%   19.14%   -0.40%     
==========================================
  Files          34       34              
  Lines        1740     1776      +36     
==========================================
  Hits          340      340              
- Misses       1400     1436      +36     

Flag	Coverage Δ
	19.14% <0.00%> (-0.40%)	⬇️

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