Introduce better security for buildpacks-phases task

[natalieparellano]

• Override /tekton/home for the detect and build phases of the lifecycle to hide registry credentials from buildpack code.
• Run analyze, restore, and export in the lifecycle image published by buildpacksio to hide registry credentials from untrusted builders.

Signed-off-by: Natalie Arellano narellano@vmware.com

Changes

Submitter Checklist

These are the criteria that every PR should meet, please check them off as you
review them:

• Includes docs (if user facing)
• Commit messages follow commit message best practices
• Yaml file complies with yamllint rules.
• Complies with Catalog Orgainization TEP, see example. Note An issue has been filed to automate this validation

  • File path follows <kind>/<name>/<version>/name.yaml

  • Has README.md at <kind>/<name>/<version>/README.md

  • Has mandatory metadata.labels - app.kubernetes.io/version the same as the <version> of the resource

  • Has mandatory metadata.annotations tekton.dev/pipelines.minVersion

  • mandatory spec.description follows the convention

      ```
    
      spec:
        description: >-
          one line summary of the resource
    
          Paragraph(s) to describe the resource.
      ```
    

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for more details.

---

[tekton-robot]

Hi @natalieparellano. Thanks for your PR.

I'm waiting for a tektoncd member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[dfreilich]

overall, looks great!

[vinamra28]

/ok-to-test

[jromero]

/approve

[tekton-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dfreilich, jromero

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Details

Needs approval from an approver in each of these files:

• task/buildpacks-phases/0.1/OWNERS [jromero]

Approvers can indicate their approval by writing /approve in a comment
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[jromero]

/lgtm