Update .forgejo/workflows/demo.yaml

.forgejo/workflows/demo.yaml

@@ -23,10 +23,15 @@ jobs:
 
       - name: Test set variable
         id: build
-        run: deno eval "Promise.resolve().then(_ => JSON.stringify(Deno.build, null, '\n')).then(console.log)" >> "$GITHUB_OUTPUT"
+        run: |
+          {
+            echo "BUILD<<EOF"
+            deno eval "console.log(JSON.stringify(Deno.build, null, '\n'))"
+            echo EOF
+          } >> "$GITHUB_OUTPUT"
 
       - name: Test get variable
-        run: echo ${{ steps.build.outputs }}
+        run: echo ${{ steps.build.outputs.BUILD }}
 
       - name: Test deno
         run: deno --version