Accommodate comma-separated config values

[kirklandnuts]

There's no way to provide comma-separated config values through the configuration argument.

For example, I want to specify a list of services via the SERVICES config variable (e.g., SERVICES=s3,ec2,secretsmanager,ecs,iam,sts,fis). However, the configuration parsing code naively splits the provided string on commas:

localstack-dagger-module/src/localstack/main.py

Lines 47 to 52 in 6e2683e

	# Add configuration variables if provided
	if configuration:
	for config_pair in configuration.split(','):
	if '=' in config_pair:
	key, value = config_pair.strip().split('=', 1)
	container = container.with_env_variable(key, value)

As such, when specifying configuration as follows, ec2 is recognized as a separate config variable rather than another service in the list of services that comprise the value for the SERVICES config variable:

dag.Localstack().Start(dag.LocalstackStartOpts{
  Configuration: "SERVICES=s3,ec2,secretsmanager,ecs,iam,sts,fis"
})

There are a few solutions to this:

1. use a non-comma delimiter to distinguish configuration key-value pairs (e.g., use ; as the delimiter: "SERVICES=s3,ec2,secretsmanager;AWS_DEFAULT_REGION=east-us-1")
2. accommodate escaped quotes (e.g., "SERVICES=\"s3,ec2,secretsmanager\",AWS_DEFAULT_REGION=east-us-1")