app: add simnet flag

[corverroos]

Adds a simnet flag to enable/disable it explicitly.

category: feature
ticket: none

[codecov]

Codecov Report

Merging #285 (45fba20) into main (20a0b61) will increase coverage by 0.08%.
The diff coverage is 60.60%.

❗ Current head 45fba20 differs from pull request most recent head 9f47cd4. Consider uploading reports for the commit 9f47cd4 to get more accurate results

@@            Coverage Diff             @@
##             main     #285      +/-   ##
==========================================
+ Coverage   58.64%   58.73%   +0.08%     
==========================================
  Files          53       53              
  Lines        4055     4066      +11     
==========================================
+ Hits         2378     2388      +10     
- Misses       1351     1356       +5     
+ Partials      326      322       -4     

Impacted Files	Coverage Δ
app/app.go	62.58% <59.37%> (+0.96%)	⬆️
cmd/run.go	100.00% <100.00%> (ø)

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[dB2510]

Looks great!