Lint topic_map yml files and fail the Travis build if errors are found

.yamllint

@@ -0,0 +1,11 @@
+---
+extends: relaxed
+rules:
+  indentation: { spaces: 2, indent-sequences: false }
+  line-length: disable
+  colons:
+    max-spaces-before: 0
+    max-spaces-after: 1
+  empty-lines: disable
+  trailing-spaces: enable
+  new-line-at-end-of-file: enable

scripts/lint-topicmaps.sh

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+#!/bin/bash
+
+# Use yamllint to lint and report errors for modified topic_map.yml files
+
+# Ensure yamllint is installed
+if ! command -v yamllint &>/dev/null; then
+    echo "yamllint is not installed. Please install it and try again 👻"
+    exit 127
+fi
+
+# List of modified topic_map files
+FILES=$(git diff --name-only HEAD~1 HEAD --diff-filter=d "./_topic_maps/*.yml")
+
+if [ -n "${FILES}" ]; then
+    has_errors=0
+    for FILE in ${FILES[@]}; do
+        if ! yamllint "$FILE"; then
+            echo "YAML error(s) found in $FILE 😥"
+            has_errors=1
+        fi
+    done
+
+    if [ $has_errors -eq 1 ]; then
+        exit 1
+    else
+        echo "No YAML errors found 🥳"
+        exit 0
+    fi
+else
+    echo "No updated topic_maps... 😙"
+    exit 0
+fi