multiline docker environment variable (via docker compose)

sample_multiline.yml

environment:
    SERVER_NAME: "myserver.doma.in" 
    # Dummy key, cert
    SSL_KEY: |-
        -----BEGIN RSA PRIVATE KEY-----
        MIICXQIBAAKBgQD272jYrLm8Ph5QpMWFcWUO9Ua1EviykalP+tkMIg12yZ3GvezF
        y8aayxdztB5vu68jqMeg6mOJlscWqFUhmAxj4mDknYenVzVX2CKzCgHlGninTKxY
        61rXDaDZVpSZ+XIESJkaB0z9HHYtrSLr0coKmq4cT5TRptOnkpDlJxIRaQIDAQAB
        AoGATcTYoGTFmiN2KK+8BWrRCQT2X9C5woNdb3LxKIEQ/HhC2HS4PRMQWW/c0vPH
        IilZ30EoneUztAFochpRtWLNg4lJoLy04X/eNjEiC/imp0KSwWXmnuLhDcWcb0+M
        slddvzHAAfK1jzIk8zEvcFnhuRoR/L3yWLQp3dIkG07h5IECQQD7xdyhfYMKiYZ7
        HIq9mU0oNaC7UvxHTw3HB4rT3yvqVZXW15JvR64qCe+sOn9xJEesGDkUUxghV+dd
        0GFOODPb2trQ1NGyKzus72JvO61pVpIhT6kVQo3xC543/+1FvU+albjtmqKe1MjZ
        32B6VtNdlgA4VzMC7qrZXwU+oD83WbG6s1GKQa/rXB8wo9moOGcNPP7PmXovDr6F
        zIVbekIj0YuTQdo31aKPNmrTVqd+iOk0LGaUC5zMi0OgDaKKDuP1Ou6ANVTcBXcF
        BnJRQ7XYtjs0oSmvA7bgbTfN4IMJxJ4hYybF1pURh/o4QW4FUytLaF8zghuTc0aP
        yKIsFLzi5ZT34KLVNGAEA44FsG71hOajFkA4c2I/SwU+
        -----END RSA PRIVATE KEY-----

Thank you, exactly what I was looking for!

Thanks!

Thanks!

this doesn't work...

@frankh

this doesn't work...

This is standard yaml string literal style. The | is for literal. The - is for not using trailing \n. Take a look at:

https://symfony.com/doc/current/components/yaml/yaml_format.html

let me clarify: docker-compose (as of 1.26.2 at least) drops the newlines no matter how you set the var in yaml