ci: sort versions by semantic increment, not literal increment

otherwise 1877.10 < 1877.9

Author: anokfireball

.github/workflows/test.yml

@@ -33,8 +33,8 @@ jobs:
         id: fetch_tag
         if: ${{ inputs.image_tag == '' || github.event_name == 'workflow_run' || github.event_name == 'push' }}
         run: |
-          #latest_tag=$(oras repo tags ghcr.io/gardenlinux/gardenlinux-ccloud | grep -E '^[0-9]+\.[0-9]+\.[0-9]+-metal-sci-usi-amd64-[0-9]+-[0-9]+-[0-9]-[0-9a-f]{8}$' | sort -r | head -n 1)
-          latest_tag=$(oras repo tags ghcr.io/gardenlinux/gardenlinux-ccloud | grep -E '^1877\.[0-9]+\.[0-9]+-metal-sci-usi-amd64-[0-9]+-[0-9]+-[0-9]+-[0-9a-f]{8}$' | sort -r | head -n 1)
+          #latest_tag=$(oras repo tags ghcr.io/gardenlinux/gardenlinux-ccloud | grep -E '^[0-9]+\.[0-9]+\.[0-9]+-metal-sci-usi-amd64-[0-9]+-[0-9]+-[0-9]-[0-9a-f]{8}$' | sort --version-sort -r | head -n 1)
+          latest_tag=$(oras repo tags ghcr.io/gardenlinux/gardenlinux-ccloud | grep -E '^1877\.[0-9]+\.[0-9]+-metal-sci-usi-amd64-[0-9]+-[0-9]+-[0-9]+-[0-9a-f]{8}$' | sort --version-sort -r | head -n 1)
           echo $latest_tag
           echo "latest_tag=$latest_tag" >> $GITHUB_ENV
       - name: Build