ci: Improve testing

[noseglasses]

• add arm tests
• don't run the whole test suite for deploying examples
• add individual tests for command line args (some still missing)

[codecov-commenter]

Codecov Report

Merging #64 (1d9a600) into master (dd6d74e) will increase coverage by 1.13%. The diff coverage is 89.51%.

@@            Coverage Diff             @@
##           master      #64      +/-   ##
==========================================
+ Coverage   87.77%   88.91%   +1.13%     
==========================================
  Files          16       16              
  Lines        1661     1777     +116     
==========================================
+ Hits         1458     1580     +122     
+ Misses        203      197       -6     

Impacted Files	Coverage Δ
tests/test.py	89.17% <89.36%> (-2.06%)	:arrow_down:
src/elf_diff/settings.py	85.46% <100.00%> (+2.22%)	:arrow_up:
src/elf_diff/binary.py	73.77% <0.00%> (+0.54%)	:arrow_up:
src/elf_diff/symbol.py	91.04% <0.00%> (+0.74%)	:arrow_up:
src/elf_diff/html.py	87.01% <0.00%> (+1.29%)	:arrow_up:
src/elf_diff/pair_report.py	92.97% <0.00%> (+1.44%)	:arrow_up:
src/elf_diff/__main__.py	92.42% <0.00%> (+6.06%)	:arrow_up:
src/elf_diff/git.py	76.47% <0.00%> (+11.76%)	:arrow_up: