Singularity: Multistage Builds

[ikaneshiro]

This will involve allowing multiple bootstrap headers to exist within a single definition file. Each header and subsequent sections generate a bundle with contents that we can copy to a later stage during the build process.

This will require adding information to definitions to identify stages and copy files from them. Currently considering adding:

• Stage: <stageName> to identify each stage in its header
• %files from <stageName> section to copy files from specific stage to current container

[dtrudg]

Can't upvote this enough :+1: :-)

[ikaneshiro]

Implemented by #3156