fix: remove build on merge groups (#2354)

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## Overview

We were building images during merge_group events as well, we don't need
to build that many images so I think it's safe to skip.

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<!-- This is an auto-generated comment: release notes by coderabbit.ai
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## Summary by CodeRabbit

- **Chores**
- Updated workflow to skip building Docker images for merge group
events, reducing unnecessary builds.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

Co-authored-by: Marko <marko@baricevic.me>

Author: chatton

.github/workflows/test.yml

@@ -11,6 +11,8 @@ on:
 jobs:
   build-docker-image:
     name: Build Docker Image
+    # skip building images for merge groups as they are already built on PRs and main
+    if: github.event_name != 'merge_group'
     runs-on: ubuntu-latest
     steps:
       - name: Checkout code