Reads the encryption password from environment variables.
An empty CREDENTIALS_ENCRYPTION_PASSWORD counts as unset: VAR= in an env
file, or ${VAR} in a compose file when the host has no such variable,
sets it to an empty string, which must not hide CONFIG_PASSWORD.
Returns string
The password string, or empty string if neither env var is set.
Reads the encryption password from environment variables. An empty CREDENTIALS_ENCRYPTION_PASSWORD counts as unset:
VAR=in an env file, or${VAR}in a compose file when the host has no such variable, sets it to an empty string, which must not hide CONFIG_PASSWORD.