Write a bash script that takes a single argument and uses a case statement to perform different actions based on the value of the argument. The script should:

1. Print “You chose the red pill. Welcome to the Matrix!” if the argument is “red”.
2. Print “You chose the blue pill. Enjoy your reality!” if the argument is “blue”.
3. Print “You chose the green pill. Time to go green!” if the argument is “green”.
4. Print “Invalid choice. Please choose red, blue, or green.” for any other argument.

Example Output:

$ ./case.sh red
You chose the red pill. Welcome to the Matrix!

$ ./case.sh blue
You chose the blue pill. Enjoy your reality!

$ ./case.sh green
You chose the green pill. Time to go green!

$ ./case.sh yellow
Invalid choice. Please choose red, blue, or green.