Update main.yml

fixed the name of the branch from master to main in order to push the docker image on the docker registry

Author: tonylook

.github/workflows/main.yml

@@ -42,7 +42,7 @@ jobs:
           password: ${{ secrets.DOCKER_PASSWORD }}
 
       - name: Build and Push Docker image
-        if: github.ref == 'refs/heads/master'
+        if: github.ref == 'refs/heads/main'
         uses: docker/build-push-action@v6
         with:
           context: .