janitor: automatically refresh branches.json

[aparcar]

For SNAPSHOTS the targets and architectures likely change over time.
Automatically create the overview file to lower manual maintenance.

Signed-off-by: Paul Spooren [email protected]

[codecov]

Codecov Report

Merging #376 (4ab287e) into master (2287136) will decrease coverage by 0.57%.
The diff coverage is 89.47%.

@@            Coverage Diff             @@
##           master     #376      +/-   ##
==========================================
- Coverage   84.43%   83.85%   -0.58%     
==========================================
  Files          13       13              
  Lines        1092     1090       -2     
==========================================
- Hits          922      914       -8     
- Misses        170      176       +6     

Impacted Files	Coverage Δ
asu/asu.py	76.66% <ø> (-3.64%)	⬇️
tests/test_api.py	100.00% <ø> (ø)
tests/test_factory.py	100.00% <ø> (ø)
tests/test_stats.py	100.00% <ø> (ø)
asu/api.py	71.03% <66.66%> (-0.55%)	⬇️
asu/janitor.py	75.00% <88.88%> (+0.50%)	⬆️
tests/test_janitor.py	100.00% <100.00%> (ø)
asu/build.py	75.52% <0.00%> (-1.20%)	⬇️
... and 2 more

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