fix: fixed lowercase method issue

Author: Rajat069

.github/workflows/build-image.yml

@@ -24,12 +24,16 @@ jobs:
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
 
+      # Step to generate lowercase repository name
+      - name: Set lowercase repository name
+        run: echo "repo=${GITHUB_REPOSITORY,,}" >> $GITHUB_ENV
+
       - name: Build and push Docker image
         uses: docker/build-push-action@v5
         with:
           context: .
           file: ./Dockerfile
           push: true # Push the image after building
           tags: |
-            ghcr.io/${{ toLower(github.repository) }}:latest
-            ghcr.io/${{ toLower(github.repository) }}:${{ github.sha }}
+            ghcr.io/${{ env.repo }}:latest
+            ghcr.io/${{ env.repo }}:${{ github.sha }}