SHIP-0042: Extending Build Volumes

[avinal]

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Propose extending build volumes for Build and BuildRuns
Refer #258

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[adambkaplan]

@avinal can you please re-number the SHIP to 0042? We have #263 as "reserved" for SHIP-0040

[SaschaSchwarze0]

I am concerned a little bit on exposing volumes generically to Build users. A Build user should not know the file system structure of any of the step's container images. Shipwright usually is opinionated/specific on capabilities. Trusted certificates would imo be a good fit for that and would therefore be an API extension. Interesting questions would then be:

• How would the API extension look like = do we make generic additional certs somewhere under .spec or specific places under .spec.source and .spec.output ? I tend to use the generic place because then those could also be made available to the strategy steps and not just our system steps.
• For our own steps, we will be able to mount them and consume them.
• We should think about how this works for strategy steps. Can we mount it just somewhere and all distros will magically pick it up? Or do we need to add some new system parameters that point to the directory with the custom certs in there (like we have other system parameters: https://shipwright.io/docs/build/buildstrategies/#system-parameters).

[adambkaplan]

Potentially replaced by #281