diff --git a/.github/workflows/build-debian-images.yaml b/.github/workflows/build-debian-images.yaml
index abf62fe..a1a4713 100644
--- a/.github/workflows/build-debian-images.yaml
+++ b/.github/workflows/build-debian-images.yaml
@@ -3,6 +3,7 @@ name: Build Debian images for PDNS CI
 on:
   workflow_dispatch:
   push:
+  pull_request:
   schedule:
     - cron: '0 23 * * *'
 
@@ -25,13 +26,17 @@ jobs:
     steps:
       - uses: actions/checkout@v3
 
+      - run: |
+          echo "image-id-lowercase=ghcr.io/${{ github.repository }}/${{ matrix.image-id }}" | tr '[:upper:]' '[:lower:]' >> "$GITHUB_ENV"
+
       - name: Build image
         run: |
           docker build . --file Dockerfile \
-            --tag ghcr.io/${{ github.repository }}/${{ matrix.image-id }}:${{ env.IMAGE_TAG }} \
+            --tag ${{ env.image-id-lowercase }}:${{ env.IMAGE_TAG }} \
             --build-arg DEBIAN_IMAGE_TAG=${{ matrix.debian-release-name }}
 
       - name: Login to GitHub Container Registry
+        if: ${{ github.event_name != 'pull_request' }}
         uses: docker/login-action@v2
         with:
           registry: ghcr.io
@@ -39,5 +44,6 @@ jobs:
           password: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Push into Github Container Registry
+        if: ${{ github.event_name != 'pull_request' }}
         run: |
-          docker push ghcr.io/${{ github.repository }}/${{ matrix.image-id }}:${{ env.IMAGE_TAG }}
+          docker push ${{ env.image-id-lowercase }}:${{ env.IMAGE_TAG }}