cd: update cd for lowercase letters

Author: AlexStefan17

.github/workflows/cd.yaml

@@ -21,10 +21,12 @@ jobs:
 
       - name: Build Docker image
         run: |
-          IMAGE_NAME=ghcr.io/${{ github.repository }}:latest
+          REPO_NAME=$(echo ${{ github.repository }} | tr '[:upper:]' '[:lower:]')
+          IMAGE_NAME=ghcr.io/$REPO_NAME:latest
           docker build -t $IMAGE_NAME .
 
       - name: Push Docker image to GitHub Container Registry
         run: |
-          IMAGE_NAME=ghcr.io/${{ github.repository }}:latest
+          REPO_NAME=$(echo ${{ github.repository }} | tr '[:upper:]' '[:lower:]')
+          IMAGE_NAME=ghcr.io/$REPO_NAME:latest
           docker push $IMAGE_NAME