chore(workflows): duplicate normalization step for image name in Docker publish workflow

- Added an additional step to normalize the image name to lowercase and store it in the environment variable `IMAGE_NAME_LOWER`, ensuring consistency across multiple job steps.

Author: michaelgpt

.github/workflows/docker-publish.yml

@@ -41,6 +41,9 @@ jobs:
       - name: Normalize image name to lowercase
         run: echo "IMAGE_NAME_LOWER=${IMAGE_NAME,,}" >> $GITHUB_ENV
 
+      - name: Normalize image name to lowercase
+        run: echo "IMAGE_NAME_LOWER=${IMAGE_NAME,,}" >> $GITHUB_ENV
+
       # Buildx is still used, but no emulation needed since runners are native
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@f95db51fddba0c2d1ec667646a06c2ce06100226 # v3.0.0
@@ -96,6 +99,9 @@ jobs:
       packages: write
       id-token: write
     steps:
+      - name: Normalize image name to lowercase
+        run: echo "IMAGE_NAME_LOWER=${IMAGE_NAME,,}" >> $GITHUB_ENV
+
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@f95db51fddba0c2d1ec667646a06c2ce06100226 # v3.0.0