add CSI2 camera support

stage-gl1/01-install-python-libraries/00-run-chroot.sh

@@ -1,14 +1,20 @@
 #!/bin/bash -e
 
-# set up a groundlight virtual environment for python
-python3 -m venv /opt/groundlight/gl-py
+# Set up a groundlight virtual environment for python. --system-site-packages is
+# required for picamera2.
+python3 -m venv /opt/groundlight/gl-py --system-site-packages
 source /opt/groundlight/gl-py/bin/activate
 
 # Now install the groundlight python libraries
 pip install groundlight
 # framegrab will install opencv-python, numpy, and pillow
 pip install framegrab
 
+# Install picamera2, required for use of Raspberry Pi CSI2 cameras. Note that there is
+# an option to install through pip, but that is not the reccommended installation
+# method. --no-install-recommends prevents installation of GUI dependencies.
+sudo apt install -y python3-picamera2 --no-install-recommends
+
 # add a .bashrc entry to activate the groundlight virtual environment
 echo "source /opt/groundlight/gl-py/bin/activate" >> /home/${FIRST_USER_NAME}/.bashrc