【AWS】samconfig.toml の parameter_overrides は配列で指定可能

version = 0.1
[default]
[default.deploy]
[default.deploy.parameters]
stack_name = "sam-app"
s3_bucket = "aws-sam-cli-managed-default-samclisourcebucket-1ru428utn0xc6"
s3_prefix = "sam-app"
region = "ap-northeast-1"
capabilities = "CAPABILITY_IAM"
parameter_overrides = "param1=\"abc\" param2=\"def\""
image_repositories = []

parameter_overridesが読みづらいが以下のように書くことができた

parameter_overrides = [
    "param1=abc",
    "param2=def"
]