feat(action): try updating environment variable across steps

.forgejo/workflows/demo.yaml

@@ -9,7 +9,13 @@ jobs:
     env:
       test: value
     steps:
-      - name: list directory contents
+      - name: checkout
+        run: |
+            git checkout
+      - name: Output and update env.test
+        run: |
+          echo ${{ env.test }}
+          echo 'test=good' >> $FORGEJO_OUTPUT
+      - name: Output updated env.test?
         run: |
-          ls -la
           echo ${{ env.test }}