diff --git a/.github/workflows/purge-readme-image-cache.yml b/.github/workflows/purge-readme-image-cache.yml
index edd4af7..15ec2e9 100644
--- a/.github/workflows/purge-readme-image-cache.yml
+++ b/.github/workflows/purge-readme-image-cache.yml
@@ -1,7 +1,6 @@
 name: Purge image cache
 
 on:
-  push:
   schedule:
     - cron: '54 18 * * *'
 
@@ -14,5 +13,8 @@ jobs:
       with:
         fetch-depth: 1
 
-    - run: |
-        curl -sL https://github.com/${GITHUB_REPOSITORY} | grep -oE '<img src="https?://camo.githubusercontent.com/[^"]+' | sed -e 's/<img src="//' | xargs -I % curl -sX PURGE %
+    - run: >
+        curl -sL https://github.com/${GITHUB_REPOSITORY} |
+        grep -oE '<img src="https?://camo.githubusercontent.com/[^"]+' |
+        sed -e 's/<img src="//' |
+        xargs -I % curl -sX PURGE %