update secrets and variables in github actions

Author: saadmdsabah

.github/workflows/main.yml

@@ -37,12 +37,12 @@ jobs:
         steps:
             - uses: docker/login-action@v3
               with:
-                  username: ${{ secrets.DOCKER_USERNAME }}
+                  username: ${{ github.DOCKER_USERNAME }}
                   password: ${{ secrets.DOCKER_PASSWORD }}
             - name: Build and push Docker images
               uses: docker/build-push-action@v5
               with:
                   context: .
                   file: ./Dockerfile
                   push: true
-                  tags: ${{ secrets.DOCKER_USERNAME }}/aws-integration:latest
+                  tags: ${{ github.DOCKER_USERNAME }}/aws-integration:latest