I was able to get the permissions to work with only the two following commands:
bitnami@hostname:~/apps/wordpress/htdocs$ sudo chown -R daemon .git/
bitnami@hostname:~/apps/wordpress/htdocs$ sudo chmod -R 755 .git/
Did you run the chown command? It seems that the 'daemon' user is running the Apache processes, which doesn't have permissions to the '.git/config' which is owned by the bitnami user.