Ensure valid Docker image name

The repository name for Docker images are supposed to be lowercase. If the Git repository has uppercase letters, the command fails with no workaround at a fix. This change ensures that the repository name for images are made lower-case.

src/DbDockerCommand.php

@@ -108,7 +108,7 @@ protected function getImagePathFromRepoUrl(string $url, string $tag): string
                 throw new InvalidOptionException("The specified git remote URL isn't supported");
         }
 
-        return sprintf("%s/%s/db:%s", $registryDomain, $path, $tag);
+        return sprintf("%s/%s/db:%s", $registryDomain, strtolower($path), $tag);
     }
 
     protected function getDbFile(): string