configured secret to be saved in env var rather than output

.github/workflows/ci-cd.yml

@@ -125,6 +125,8 @@ jobs:
           - ants
           - fsl
           - freesurfer
+    env:
+      SECRET: ""
     steps:
     - name: Get secret for corresponding repo
       id: get_secret
@@ -138,13 +140,13 @@ jobs:
         elif [ "${{ matrix.repo }}" == "freesurfer" ]; then
           SECRET="${{ secrets.FREESURFER_PAT }}"
         fi
-        echo "SECRET=$SECRET" >> $GITHUB_OUTPUT
+        echo "SECRET=$SECRET" >> $GITHUB_ENV
 
     - name: Trigger post-release on downstream repos
-      if: github.event_name == 'release' && steps.get_secret.outputs.SECRET
+      if: github.event_name == 'release' && env.SECRET
       run: |
-        curl -XPOST -u "${{ steps.get_secret.outputs.SECRET }}" -H "Accept: application/vnd.github.everest-preview+json" \
+        curl -XPOST -u "${{ env.SECRET }}" -H "Accept: application/vnd.github.everest-preview+json" \
         "https://api.github.com/repos/nipype/pydra-${{ matrix.repo }}/dispatches" \
         -d '{"event_type": "create-post-release"}'
       env:
-        PAT: ${{ steps.get_secret.outputs.SECRET }}
+        PAT: ${{ env.SECRET }}