You have a database pod with a MySQL image. But to get access to the container, you need to set a password.
Set the password value of the environment variable MYSQL_ROOT_PASSWORD as "root".
apiVersion: v1
kind: Pod
metadata:
name: database-pod
spec:
containers:
- name: database-container
image: mysql:latest
env:
- name: MYSQL_ROOT_PASSWORD
Copy the manifest and complete it by adding a single line with the key and the value separated by a :.