There are several variables available for you to use in your build steps:
$ASSET_DIR |
The filepath which contains any assets you uploaded to your Probo project. |
$BRANCH_NAME |
The name of the branch the build is based on. |
$BRANCH_LINK |
An HTML link to the branch (in Github, Bitbucket, etc). |
$BUILD_ID |
The ID for the build. |
$BUILD_DOMAIN |
The HTTPS URL of the build. |
$COMMIT_REF |
The commit ID the build is based on. |
$COMMIT_LINK |
An HTML link to the commit (in Github, Bitbucket, etc). |
$PROBO_ENVIRONMENT |
Boolean acknowledging the build is in Probo. |
$PULL_REQUEST_NAME |
The name of the Pull Request. |
$PULL_REQUEST_LINK |
An HTML link to the pull request (in Github, Bitbucket, etc). |
$SRC_DIR |
The filepath which contains the code from your pull request. |