[CI] Modify Nightly task to run opencl:cpu testing on different CPUs (i…

…ntel#12548)

We have flakyness in nightly testing results. Having more variety would
helpfully provide some insights on conditions when it happens.

The task is only executed once a day, so extra resources needed
shouldn't affect the load on the runners much.

.github/workflows/sycl-nightly.yml

@@ -48,8 +48,20 @@ jobs:
             target_devices: opencl:gpu
             reset_gpu: true
 
-          - name: OCL CPU
-            runner: '["Linux", "x86-cpu"]'
+          - name: OCL CPU (AMD)
+            runner: '["Linux", "amdgpu"]'
+            image: ghcr.io/intel/llvm/ubuntu2204_intel_drivers:latest
+            image_options: -u 1001
+            target_devices: opencl:cpu
+
+          - name: OCL CPU (Intel/GEN12)
+            runner: '["Linux", "gen12"]'
+            image: ghcr.io/intel/llvm/ubuntu2204_intel_drivers:latest
+            image_options: -u 1001
+            target_devices: opencl:cpu
+
+          - name: OCL CPU (Intel/Arc)
+            runner: '["Linux", "arc"]'
             image: ghcr.io/intel/llvm/ubuntu2204_intel_drivers:latest
             image_options: -u 1001
             target_devices: opencl:cpu