fix(ci/json-build): don't install build deps when mock (#5128) (#5175)

(cherry picked from commit 5b54506355)

Signed-off-by: madomado <madonuko@outlook.com>
Signed-off-by: RockGrub <RockGrub@users.noreply.github.com>
Co-authored-by: madomado <madonuko@outlook.com>

.github/workflows/json-build.yml

@@ -35,7 +35,7 @@ jobs:
           fi
 
       - name: Install Build Dependencies
-        if: ${{ !contains(matrix.pkg.labels, 'mock') }}
+        if: ${{ matrix.pkg.labels.mock != '1' }}
         run: |
           dir=$(dirname ${{ matrix.pkg.pkg }})
           dnf5 builddep -y ${dir}/*.spec