fix condition

Signed-off-by: Yury-Fridlyand <yury.fridlyand@improving.com>

.github/workflows/create-test-matrices/action.yml

@@ -51,7 +51,7 @@ runs:
           id: load-host-matrix
           shell: bash
           run: |
-              CONDITION=$([ ${{ inputs.containers }} == "true" ] ? ".IMAGE?" : ".IMAGE == null" )
+              [[ ${{ inputs.containers }} == true ]] && CONDITION=".IMAGE?" || CONDITION=".IMAGE == null"
               echo 'Select runners (VMs) to run tests on'
               if [[ "${{ github.event_name }}" == "pull_request" || "${{ github.event_name }}" == "push" || "${{ inputs.run-full-matrix }}" == "false" ]]; then
                   echo 'Pick runners marked as '"run": "always"' only - on PR, push or manually triggered job which does not require full matrix'