Add autofix ci (#42)

* Add autofix CI job

* Remove required whitespace

* [autofix.ci] apply automated fixes

---------

Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>

.github/workflows/autofix.yml

@@ -0,0 +1,22 @@
+name: autofix.ci # needed to securely identify the workflow
+
+on:
+  pull_request:
+
+permissions:
+  contents: read
+
+jobs:
+  autofix-text:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install npx (for prettier)
+        run: sudo apt install nodejs
+
+      - name: Format Markdown
+        run: ./tools/format_md.sh
+
+      # Get latest version from https://autofix.ci/setup
+      - uses: autofix-ci/action@dd55f44df8f7cdb7a6bf74c78677eb8acd40cd0a