try escape quotes

Author: flexatone

.github/workflows/ci.yml

@@ -35,7 +35,7 @@ jobs:
     steps:
       - run: echo "$GITHUB_EVENT_NAME"
       - id: step
-        run: echo "matrix_os=[macos-13, ubuntu-22.04, windows-2022]" >> $GITHUB_OUTPUT
+        run: echo "matrix_os=\"[\"macos-13\", \"ubuntu-22.04\", \"windows-2022\"]\"" >> $GITHUB_OUTPUT
 
 
   whl_3_8:
@@ -45,7 +45,7 @@ jobs:
       fail-fast: false
       matrix:
         # os: [macos-13-xlarge, ubuntu-22.04, windows-2022]
-        os: ${{fromJson(needs.matrix_config.outputs.matrix_os)}}
+        os: ${{ fromJson(needs.matrix_config.outputs.matrix_os) }}
         minor: [8]
     runs-on: ${{ matrix.os }}
     steps: