Add Dockerfile for feedwitness tool

[AlCutter]

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 20.62%. Comparing base (3c58af4) to head (3e96736).
⚠️ Report is 216 commits behind head on main.

❗ There is a different number of reports uploaded between BASE (3c58af4) and HEAD (3e96736). Click for more details.

HEAD has 2 uploads less than BASE

Flag	BASE (3c58af4)	HEAD (3e96736)
	4	2

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #404       +/-   ##
===========================================
- Coverage   51.05%   20.62%   -30.43%     
===========================================
  Files          11       27       +16     
  Lines         903     2036     +1133     
===========================================
- Hits          461      420       -41     
- Misses        374     1555     +1181     
+ Partials       68       61        -7     

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