Split the environment variable string in half using the first = character

[asungomez]

Description of changes

When an environment variable in the docker-compose.yml file of a container contains a = character, such as:

DB_CONNECTION_PARAMETERS=replicaSet=rs0&readPreference=secondaryPreferred&retryWrites=false

It splits the string by the = character and takes the first element as the variable key and the second as the value. For the previous example, it includes the following variable on the CF stack:

{
  "Name": "DB_CONNECTION_PARAMETERS",
  "Value": "replicaSet"
}

This Pull Request fixes that issue by splitting the string in half using the first = sign only, so the resulting environment variable is:

{
  "Name": "DB_CONNECTION_PARAMETERS",
  "Value": "replicaSet=rs0&readPreference=secondaryPreferred&retryWrites=false"
}

CDK / CloudFormation Parameters Changed

• Fixed the generation of environment variables for ECS Task definitions, so they accept the character = in their value.

Description of how you validated changes

Created a Container instance passing to the constructor an environment variable string with the = sign in the value.

Checklist

• PR description included
• yarn test passes

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[dpilch]

Hi @asungomez, the change looks good to me. Could you add a unit test to ensure the behavior?