CodeExecutor.Dockerfile needs to be modified with the retool version

[samsternatretool]

In the EC2 Standalone module we rewrite the Dockerfile to include the specified retool version:

terraform-retool-modules/modules/aws_ec2_standalone/main.tf

Line 95 in 16be9cd

# Rewrite Dockerfile

However we leave the literal "x.y.z" in the CodeExecutor.Dockerfile which means docker-compose up fails and the instance seems unresponsive.

We should rewrite/modify that Dockerfile with the same version.

[mikewang333]

hopefully should be handled with this change: #89!