Environment Variables

Some parts of the build can be configured with environment variables. These are often prefixed with RAILPACK_.

Build Configuration

Name	Description
`BUILD_CMD`	Set the command to run for the build step. This overwrites any commands that come from providers
`START_CMD`	Set the command to run when the container starts
`PACKAGES`	Install additional Mise packages. In the format `pkg@version`. The latest version is used if not provided.
`BUILD_APT_PACKAGES`	Install additional Apt packages during build
`DEPLOY_APT_PACKAGES`	Install additional Apt packages in the final image

To configure more parts of the build, it is recommended to use a config file.

These environment variables affect the behavior of Railpack:

Name	Description
`FORCE_COLOR`	Force colored output even when not in a TTY