feat(action): try use output variables

.forgejo/workflows/demo.yaml

@@ -12,10 +12,12 @@ jobs:
       # - name: checkout
       #   run: |
       #       git checkout
-      - name: Output and update env.test
+      - name: Output and set some-result.test
+        id: some-result
         run: |
           echo ${{ env.test }}
           echo 'test=good' >> $FORGEJO_OUTPUT
       - name: Output updated env.test?
         run: |
-          echo ${{ env.test }}
+          echo ${{ steps.some-result.outputs.test }}
+          test ${{ steps.some-result.outputs.test }} = good