A Heroku buildpack that configures a GO project built on the new 1.18 workspace.

This buildpack will setup Heroku GO build directives and the GO procfile based on environment variables. This environmental variable solution will allow a monorepo relying on a GO workspace to build multiple different dynos.

This buildpack will not compile GO code or complete a release. It is intended as a pre-processor for the standard GO work buildpack.

2 environment variables are expected, both pointing to files within the GO project itself.

This variable points to a file containing Heroku build directives that will be added to the go.work file.

For example:

HEROKU_WORK_DIRECTIVES_FILE=project/heroku-directives.txt

The project/heroku-directives.txt file contains the following content

// +heroku goVersion go1.18
// +heroku install ./cmd/...

The go.work file also has the placeholder //HEROKU_WORK_DIRECTIVES added.

The build will replace the placeholder variable //HEROKU_WORK_DIRECTIVES with the content of the project/heroku-directives.txt file.

This variable points to a file containing the Heroku procfile contents.

For example:

HEROKU_WORK_PROCFILE=project/Project-Procfile

The project/Project-Procfile file contains the following content

web: server

The contents of this file are copied to the root of the project in a new file named Procfile.