lowercase user name

.github/workflows/docker-build.yml

@@ -6,7 +6,6 @@ on:
       - main
       - ci-test 
 
-
 jobs:
   build-and-push:
     runs-on: ubuntu-latest
@@ -27,9 +26,15 @@ jobs:
             username: ${{ github.actor }}
             password: ${{ secrets.GITHUB_TOKEN }}
 
+        - name: set lower case owner name
+          run: |
+            echo "OWNER_LC=${OWNER,,}" >>${GITHUB_ENV}
+          env:
+            OWNER: '${{ github.repository_owner }}'
+        
         - name: Build Docker image
           run: |
-              docker build -t ghcr.io/${{ github.repository }}/go-web-server:latest .
+            docker build -t ghcr.io/${{ github.repository_id }}/go-web-server:latest .
   
         - name: Push Docker image to GitHub Container Registry
           run: |