Add default builders to func environment

[lance]

See: #1787

/kind good-first-issue
/good-first-issue

[knative-prow]

@lance:
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In response to this:

See: #1787

/kind good-first-issue
/good-first-issue

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[rutvik24]

@lance I would like to work on this issue if someone is not working on this issue then please can you assign it to me?

[lance]

@rutvik24 thank you for the offer! However, there is already an open PR for this issue here #1796

[lance]

/assign @nitishchauhan0022

[knative-prow]

@lance: GitHub didn't allow me to assign the following users: nitishchauhan0022.

Note that only knative members with read permissions, repo collaborators and people who have commented on this issue/PR can be assigned. Additionally, issues/PRs can only have 10 assignees at the same time.
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In response to this:

/assign @nitishchauhan0022

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