Don't check latest UI tag when building container in UI

Since the goal is to verify if container can be built, we should use
latest frontend main tip, not some tag which might be old.

.github/workflows/ci.yml

@@ -51,11 +51,6 @@ jobs:
           repository: "KustoszApp/web-ui"
           path: ".frontend"
           fetch-depth: 0
-      - name: Checkout latest frontend tag
-        run: |
-          cd .frontend
-          export previousTag=$(git tag --sort=-creatordate | head -n 1)
-          git checkout "$previousTag"
       - name: Build container image
         uses: redhat-actions/buildah-build@v2
         with: