Implement a persist marker.

[tobiasraabe]

No description provided.

[codecov]

Codecov Report

Merging #28 into main will increase coverage by 1.93%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main      #28      +/-   ##
==========================================
+ Coverage   93.87%   95.81%   +1.93%     
==========================================
  Files          31       29       -2     
  Lines        1356     1648     +292     
==========================================
+ Hits         1273     1579     +306     
+ Misses         83       69      -14     

Flag	Coverage Δ
#end_to_end	94.29% <ø> (+12.65%)	⬆️
#integration	?
#unit	60.31% <ø> (-18.16%)	⬇️

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Impacted Files	Coverage Δ
src/_pytask/__init__.py	100.00% <ø> (ø)
src/_pytask/build.py	90.74% <ø> (ø)
src/_pytask/clean.py	90.35% <ø> (ø)
src/_pytask/cli.py	100.00% <ø> (ø)
src/_pytask/collect.py	94.06% <ø> (ø)
src/_pytask/config.py	100.00% <ø> (ø)
src/_pytask/dag.py	100.00% <ø> (ø)
src/_pytask/database.py	100.00% <ø> (ø)
src/_pytask/debugging.py	58.82% <ø> (ø)
src/_pytask/enums.py	100.00% <ø> (ø)
... and 49 more

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Δ = absolute <relative> (impact), ø = not affected, ? = missing data
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