fix: preserve JSON matrix output by using single-quoted echo

Author: ghassenzaara

.github/workflows/falkor_db.yml

@@ -44,8 +44,8 @@ jobs:
     steps:
       - id: set
         run: |
-          echo "os=${{ github.event_name == 'push' && '["ubuntu-latest"]' || env.TEST_MATRIX_OS }}" >> "$GITHUB_OUTPUT"
-          echo "python-version=${{ github.event_name == 'push' && '["3.10"]' || env.TEST_MATRIX_PYTHON }}" >> "$GITHUB_OUTPUT"
+          echo 'os=${{ github.event_name == 'push' && '["ubuntu-latest"]' || env.TEST_MATRIX_OS }}' >> "$GITHUB_OUTPUT"
+          echo 'python-version=${{ github.event_name == 'push' && '["3.10"]' || env.TEST_MATRIX_PYTHON }}' >> "$GITHUB_OUTPUT"
 
   run:
     name: Python ${{ matrix.python-version }} on ${{ startsWith(matrix.os, 'macos-') && 'macOS' || startsWith(matrix.os, 'windows-') && 'Windows' || 'Linux' }}