ci: Don't rebuild images on doc only changes

.github/workflows/ci.yml

@@ -1,10 +1,11 @@
 name: ci
 
 on:
-
   pull_request:
     branches:
-    - main
+      - main
+    paths-ignore:
+      - 'docs/**'
 
 jobs:
   build-image:

.github/workflows/publish-image.yml

@@ -3,7 +3,9 @@ name: publish-image
 on:
   push:
     branches:
-    - main
+      - main
+    paths-ignore:
+      - 'docs/**'
 
   workflow_dispatch: