Add RVV variant tests to CI. (#942)

Author: alan-forbes-cp

.github/actions/do_build_ock_artefact/action.yml

@@ -68,6 +68,8 @@ runs:
           # Do we need the offline kernel as an artefact? If so currently this requires an external clc or qemu to be installed.
           offline_kernel_tests: OFF
           host_fp16: ON
+          # debug_support: ON needed for riscv64 rvv variant testing
+          debug_support: ${{ steps.calc_vars.outputs.arch == 'riscv64' && 'ON' || 'OFF' }}
 
       - name: download previous ock if needed ${{ inputs.target }} ${{ matrix.download_dpcpp_artefact}}
         shell: bash      

.github/actions/run_opencl_cts/action.yml

@@ -76,4 +76,5 @@ runs:
           -e CL_PLATFORM_INDEX=0 \
           -s $CTS_CSV_FILE_PATH \
           -i $GITHUB_WORKSPACE/source/cl/scripts/$CTS_FILTER \
-          -o override_combined.csv
+          -o override_combined.csv \
+          -e CA_HOST_TARGET_FEATURES=+v