podman-compose/tests/interpolation/docker-compose.yml

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version: "3.7"
services:
variables:
image: busybox
command: ["/bin/busybox", "sh", "-c", "export | grep EXAMPLE"]
environment:
EXAMPLE_VARIABLE: "Host user: $USER"
EXAMPLE_BRACES: "Host user: ${USER}"
EXAMPLE_COLON_DASH_DEFAULT: ${NOT_A_VARIABLE:-My default}
EXAMPLE_DASH_DEFAULT: ${NOT_A_VARIABLE-My other default}
EXAMPLE_DOT_ENV: $DOT_ENV_VARIABLE
EXAMPLE_LITERAL: This is a $$literal
EXAMPLE_EMPTY: $NOT_A_VARIABLE