diff --git a/.github/workflows/docker-build.yml b/.github/workflows/docker-build.yml
index f92cc7a..0302cb8 100644
--- a/.github/workflows/docker-build.yml
+++ b/.github/workflows/docker-build.yml
@@ -26,6 +26,12 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v4
 
+      - name: Prepare repository variables
+        id: prep
+        run: |
+          echo "REPO_NAME=$(echo ${{ github.repository }} | tr '/' ' ' | awk '{print tolower($2)}')" >> $GITHUB_OUTPUT
+          echo "OWNER=$(echo ${{ github.repository_owner }} | tr '[:upper:]' '[:lower:]')" >> $GITHUB_OUTPUT
+
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
 
@@ -42,7 +48,7 @@ jobs:
           context: .
           push: ${{ github.event_name != 'pull_request' }}
           tags: |
-            ghcr.io/${{ github.repository_owner }}/${{ github.event.repository.name }}:latest
-            ghcr.io/${{ github.repository_owner }}/${{ github.event.repository.name }}:${{ github.sha }}
+            ghcr.io/${{ steps.prep.outputs.OWNER }}/${{ steps.prep.outputs.REPO_NAME }}:latest
+            ghcr.io/${{ steps.prep.outputs.OWNER }}/${{ steps.prep.outputs.REPO_NAME }}:${{ github.sha }}
           cache-from: type=gha
           cache-to: type=gha,mode=max