fix: add checkout step to merge-and-push job in workflow

[tekenstam]

Fix Docker image build in GitHub Actions workflow

Issue

The GitHub Actions workflow to build and push Docker images was failing with the error:

ERROR: failed to solve: failed to read dockerfile: open Dockerfile: no such file or directory

Root Cause

The merge-and-push job was missing the actions/checkout@v4 step, so the repository content (including the Dockerfile) wasn't available in this job's runner environment. In GitHub Actions, each job runs in a completely fresh environment, requiring explicit repository checkout.

Solution

Added the actions/checkout@v4 step to the beginning of the merge-and-push job to ensure the Dockerfile and other repository files are available during the Docker 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 (444e1fb) to head (3043867).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #482   +/-   ##
=======================================
  Coverage   46.13%   46.13%           
=======================================
  Files          40       40           
  Lines        7004     7004           
=======================================
  Hits         3231     3231           
  Misses       3617     3617           
  Partials      156      156           

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