Expose GOCACHE as volume in ko build strategy

[SaschaSchwarze0]

Changes

Extending the ko build strategy with volume support for GOCACHE. This speeds up rebuilds dramatically when a Build user enables it. The build strategy by default uses an emptyDir which means that no caching happens. A Build user can assign any writable volume type to enable caching.

Submitter Checklist

• Includes tests if functionality changed/was added
• Includes docs if changes are user-facing
• Set a kind label on this PR
• Release notes block has been filled in, or marked NONE

Release Notes

The ko sample build strategy now supports a gocache volume that you can assign a writable volume in your Build to speed up rebuilds

[SaschaSchwarze0]

fyi @rolfedh contains a small documentation change

[rolfedh]

fyi @rolfedh contains a small documentation change
Please go ahead and merge these changes - I'll transfer them to the asciidoc content.

[rolfedh]

/lgtm

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[rolfedh]

@SaschaSchwarze0. I have copied your new Volumes subsection from buildstrategies.md to buildstrategies.adoc in shipwright-io/website#79. Thanks.

[qu1queee]

/approve

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[qu1queee]

/lgtm