Backport PR #2263: fix(ci): fetch full git history in QA workflow so server reports real version (#2263)

The Dockerfile bakes .git into the image for hatch-vcs version detection,
but the workflow's shallow, tag-less checkout meant the built server always
reported version 0.1.dev1+<hash>, which failed flexmeasures-client's
minimum-server-version check. Matches the fetch-depth: 0 already used in
docker-publish.yml for the same reason.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Qprz6PKnXkVE1TJ8d7PYe9

(cherry picked from commit 0e48110)

Author: Flix6x

.github/workflows/docker-qa.yml

@@ -37,6 +37,8 @@ jobs:
     steps:
       - name: Checkout flexmeasures
         uses: actions/checkout@v4
+        with:
+          fetch-depth: 0 # full history + tags, required for hatch-vcs to resolve the version
 
       - name: Checkout flexmeasures-client
         uses: actions/checkout@v4