ci: add `paths-ignore`

Change-Id: I32bdb15e5063a22f8ff642281c473e15e571f0f2
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index d25d92a..ed54263 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -1,6 +1,10 @@
 name: CI
 on:
   push:
+    paths-ignore:
+      - 'manpages/**'
+      - '*.md'
+      - '.mailmap'
   workflow_dispatch:
 
 permissions: {}