fix(ci): correct buildkit runner labels for cn12-001 cluster

Runner labels should match scaleSetLabels from ARC values.yaml
(linux-aarch64-cpu-4-buildkit / linux-amd64-cpu-4-buildkit)
instead of the guiyang cluster labels (-gy006 suffix).

Signed-off-by: JavaPythonAIForBAT <wuhejun@h-partners.com>

Author: JavaPythonAIForBAT

.github/workflows/buildkit-dockerfile-test.yaml

@@ -25,8 +25,8 @@ jobs:
           - Dockerfile.a3.openEuler
           - Dockerfile.openEuler
         runner_info:
-          - {runner: linux-aarch64-cpu-4-buildkit-gy006, arch: arm64}
-          - {runner: linux-amd64-cpu-4-buildkit-gy006, arch: amd64}
+          - {runner: linux-aarch64-cpu-4-buildkit, arch: arm64}
+          - {runner: linux-amd64-cpu-4-buildkit, arch: amd64}
 
     steps:
       - name: Checkout