feat: check for trailing spaces in CI

.gitlab-ci.yml

@@ -6,6 +6,10 @@ test-links:
   script:
     - python3 ./test_links.py
 
+test-trailing-spaces:
+  script:
+    - ./test_trailing_spaces.sh
+
 test-build:
   image: registry.gitlab.com/pages/hugo/hugo_extended
   script:

test_trailing_spaces.sh

@@ -0,0 +1,9 @@
+#!/bin/bash
+
+TRAILING_SPACES=$(find content -name '*.md' -exec grep -EHn ' +$' {} \;)
+
+if [[ -n "$TRAILING_SPACES" ]]; then
+    echo "Error: these files have trailing spaces!"
+    echo "$TRAILING_SPACES"
+    exit 1
+fi