Formatting: format and add CI action

[odow]

No description provided.

[codecov]

Codecov Report

Merging #2511 (089f86a) into master (8b13032) will decrease coverage by 0.00%.
The diff coverage is 88.79%.

@@            Coverage Diff             @@
##           master    #2511      +/-   ##
==========================================
- Coverage   93.69%   93.69%   -0.01%     
==========================================
  Files          43       43              
  Lines        5313     5360      +47     
==========================================
+ Hits         4978     5022      +44     
- Misses        335      338       +3     

Impacted Files	Coverage Δ
src/_Derivatives/subexpressions.jl	97.61% <ø> (ø)
src/file_formats.jl	100.00% <ø> (ø)
src/lp_sensitivity2.jl	99.32% <ø> (ø)
src/utils.jl	57.14% <ø> (ø)
src/_Derivatives/sparsity.jl	97.59% <50.00%> (ø)
src/lp_sensitivity.jl	93.78% <64.28%> (ø)
src/_Derivatives/forward.jl	97.82% <66.66%> (ø)
src/optimizer_interface.jl	75.00% <69.23%> (ø)
src/nlp.jl	92.66% <75.00%> (+0.01%)	⬆️
src/sets.jl	90.47% <80.00%> (ø)
... and 19 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 8b13032...089f86a. Read the comment docs.

[odow]

Time to bite the bullet and add a CI check?