Could you try executing the following commands instead (using the Bitnami environment)?
sudo apt-get install libgdal-dev
sudo pip install pygdal==`gdal-config --version`
We found issues with the current version of the Bitnami environment (version mismatch with
gdal-config), so we will try to check how to install it properly and upgrade
gdal-config. If we find anything, we'll let you know.