fix: add back file pointing to dockerfile

[tekenstam]

Root Cause

In the merge-and-push job, the docker/build-push-action@v6 step was missing the file: ./Dockerfile parameter that specifies the location of the Dockerfile. This parameter was correctly specified in the build-image job but was missing in the final push step.

Solution

Added the missing file: ./Dockerfile parameter to the Create manifest list and push step in the merge-and-push job, allowing the action to locate the Dockerfile during the build process.

Testing

• This change can be verified when the workflow runs on this branch

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 46.13%. Comparing base (8fc92f8) to head (0c07d76).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #481   +/-   ##
=======================================
  Coverage   46.13%   46.13%           
=======================================
  Files          40       40           
  Lines        7004     7004           
=======================================
  Hits         3231     3231           
  Misses       3617     3617           
  Partials      156      156           

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