Use org-level defined secret, if available

action.yml

@@ -1,9 +1,5 @@
 name: "Determine Fedora versions"
 description: "Determine the latest and previous versions of Fedora to run the CI against"
-inputs:
-  test-override:
-    description: 'Override matrix for testing'
-    required: true
 outputs:
   matrix: 
     description: "Fedora versions"
@@ -16,11 +12,11 @@ runs:
         export latest=$(cat /etc/fedora-release | awk '{ print $3 }')
         export previous=$(cat /etc/fedora-release | awk '{ print $3 - 1}')
         echo "Running CI against Fedora $previous and $latest"
-        if [ "${{ inputs.test-override }}" == "" ]
+        if [ "${{ secrets.MATRIX }}" == "" ]
         then
           echo "::set-output name=matrix::{\"os\":[\"$previous\", \"$latest\"]}"
         else
-          echo "::set-output name=matrix::${{ inputs.test-override }}"
+          echo "::set-output name=matrix::${{ secrets.MATRIX }}"
         fi
         echo "::set-output name=matrix::{\"os\":[\"$previous\", \"$latest\"]}"
       shell: bash