fix: store absolute paths when scanning containers

[G-Rath]

Turns out container scanning is not using absolute paths in its results, which isn't breaking anything but is an assumption of our output package

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 67.58%. Comparing base (0bccdcd) to head (4452713).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2084   +/-   ##
=======================================
  Coverage   67.58%   67.58%           
=======================================
  Files         170      170           
  Lines       16148    16149    +1     
=======================================
+ Hits        10913    10914    +1     
  Misses       4569     4569           
  Partials      666      666           

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[another-rex]

Interesting, it looks like the store absolute path option breaks layer tracing

[another-rex]

Opened this to fix it: google/osv-scalibr#916