ci: skip CI checks for documentation and data-only changes (#42)

Add paths-ignore filters for .md and .csv files so that PRs
updating only documentation or data (e.g. tercet_missing_codes.csv)
do not trigger the full code-oriented CI pipeline.

Closes #41

Co-authored-by: OSMENDA Michal <michal.osmenda@ext.ec.europa.eu>

Author: bk86a

.github/workflows/ci.yml

@@ -3,8 +3,14 @@ name: CI
 on:
   push:
     branches: [main]
+    paths-ignore:
+      - '**.md'
+      - '**.csv'
   pull_request:
     branches: [main]
+    paths-ignore:
+      - '**.md'
+      - '**.csv'
 
 permissions:
   contents: read