Google Colab conda packages permanently installation
There is no way to permanently install packages because the code is run on virtual machines that are sometimes recycled. You'll need to install it each time.
From the FAQ:

Where is my code executed? What happens to my execution state if I close the browser window?
Code is executed in a virtual machine dedicated to your account. Virtual machines are recycled when idle for a while, and have a maximum lifetime enforced by the system.