diff --git a/.github/workflows/docker.yml b/.github/workflows/docker.yml
index fa7d78758..ad32a67c2 100644
--- a/.github/workflows/docker.yml
+++ b/.github/workflows/docker.yml
@@ -18,10 +18,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        platform:
-          - linux/amd64
-          - linux/arm64
-          - linux/arm/v7
+        platform: ${{ github.event_name == 'pull_request' && fromJSON('["linux/amd64"]') || fromJSON('["linux/amd64","linux/arm64","linux/arm/v7"]') }}
     steps:
       - name: Prepare
         run: |