hotfix/fix docker build (#21)

# PR Context
<!-- Additional info for the reviewer -->

Docker build is currently broken, as partial version numbers for github
actions do not work (see
[here](https://github.com/robert-koch-institut/mex-drop/actions/runs/9265211033/job/25486780307)).
I therefore replaced the version with the full version.

# Fixed

- docker build action: full version number of action dependency is
required

Co-authored-by: Kamran Ali <[email protected]>

mex-{{ cookiecutter.project_name }}/.github/workflows/docker.yml

@@ -11,4 +11,4 @@ jobs:
     timeout-minutes: 10
     steps:
       - name: Build, tag and push docker image to ghcr
-        uses: GlueOps/[email protected]
+        uses: GlueOps/[email protected].2