diff --git a/.github/workflows/docker-image.yml b/.github/workflows/docker-image.yml
index 5112706..3f4682f 100644
--- a/.github/workflows/docker-image.yml
+++ b/.github/workflows/docker-image.yml
@@ -16,7 +16,6 @@ concurrency:
   cancel-in-progress: true
 env:
   REGISTRY: ghcr.io
-  IMAGE_NAME: ${{ toLower(github.repository) }}
 jobs:
   build-and-push:
     runs-on: ubuntu-latest
@@ -34,6 +33,8 @@ jobs:
     steps:
       - name: Checkout repository
         uses: actions/checkout@v4
+      - name: Set image name to lowercase
+        run: echo "IMAGE_NAME=$(echo '${{ github.repository }}' | tr '[:upper:]' '[:lower:]')" >> $GITHUB_ENV
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
         with:
@@ -102,6 +103,8 @@ jobs:
       - build-and-push
     if: github.event_name != 'pull_request'
     steps:
+      - name: Set image name to lowercase
+        run: echo "IMAGE_NAME=$(echo '${{ github.repository }}' | tr '[:upper:]' '[:lower:]')" >> $GITHUB_ENV
       - name: Download digests
         uses: actions/download-artifact@v4
         with: