Fix broken export-data admin command and add a test for it to CI (#11078)

Fix broken export-data admin command and add a test for it to CI

.github/workflows/tests.yml

@@ -253,6 +253,35 @@ jobs:
             /logs/results.tap
             /logs/**/*.log*
 
+  export-data:
+    if: ${{ !failure() && !cancelled() }} # Allow previous steps to be skipped, but not fail
+    needs: [linting-done, portdb]
+    runs-on: ubuntu-latest
+    env:
+      TOP: ${{ github.workspace }}
+
+    services:
+      postgres:
+        image: postgres
+        ports:
+          - 5432:5432
+        env:
+          POSTGRES_PASSWORD: "postgres"
+          POSTGRES_INITDB_ARGS: "--lc-collate C --lc-ctype C --encoding UTF8"
+        options: >-
+          --health-cmd pg_isready
+          --health-interval 10s
+          --health-timeout 5s
+          --health-retries 5
+
+    steps:
+      - uses: actions/checkout@v2
+      - run: sudo apt-get -qq install xmlsec1
+      - uses: actions/setup-python@v2
+        with:
+          python-version: "3.9"
+      - run: .ci/scripts/test_export_data_command.sh
+
   portdb:
     if: ${{ !failure() && !cancelled() }} # Allow previous steps to be skipped, but not fail
     needs: linting-done