fix(ci): normalize IMAGE_NAME to lowercase for registry compliance

.github/workflows/docker-build.yml

@@ -27,6 +27,12 @@ jobs:
       - name: 📥 Checkout code
         uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4
 
+      # Normalize IMAGE_NAME to lowercase to satisfy container registry format
+      - name: 🔤 Normalize image name
+        run: |
+          raw="${{ github.repository_owner }}/${{ github.event.repository.name }}"
+          echo "IMAGE_NAME=$(echo "$raw" | tr '[:upper:]' '[:lower:]')" >> $GITHUB_ENV
+
       # Step 2: Set up QEMU for multi-platform builds (ARM, AMD64, etc.)
       - name: 🔧 Set up QEMU
         uses: docker/setup-qemu-action@c7c53464625b32c7a7e944ae62b3e17d2b600130 # v3
@@ -160,6 +166,11 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
+      # Ensure normalized lowercase IMAGE_NAME for this job as well
+      - name: 🔤 Normalize image name
+        run: |
+          raw="${{ github.repository_owner }}/${{ github.event.repository.name }}"
+          echo "IMAGE_NAME=$(echo "$raw" | tr '[:upper:]' '[:lower:]')" >> $GITHUB_ENV
       # Step 1: Figure out which tag to test
       - name: 🏷️ Determine image tag
         id: tag