Resolving AWS Lambda "Permission Denied" with docker image

If you get the error with "Permission denied: '/app/function.py'" for a Lambda function that uses a docker image. You need to update the 'docker file' with

"RUN chmod -R o+rX ."

to change the file mode where all files and folders in the current directory is readable by any user.

Reference: https://docs.aws.amazon.com/lambda/latest/dg/troubleshooting-deployment.html