chore(release): add tekton artifacts to release

[lance]

Changes

Adds the Tekton tasks for buildpacks, s2i and deployment to the release artifacts.

Note that the checksums.txt file will contain references to the full path of the files. I don't think this is a problem, but something to be look out for in case there is an issue.

/kind chore

Release Note

Adds Tekton Tasks to release artifacts.

Fixes: #1550
Related: #1333

[codecov]

Codecov Report

Base: 60.28% // Head: 60.54% // Increases project coverage by +0.26% 🎉

Coverage data is based on head (bd30d4d) compared to base (5a4803b).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1557      +/-   ##
==========================================
+ Coverage   60.28%   60.54%   +0.26%     
==========================================
  Files          75       76       +1     
  Lines       10214    10216       +2     
==========================================
+ Hits         6157     6185      +28     
+ Misses       3489     3462      -27     
- Partials      568      569       +1     

Flag	Coverage Δ
integration-tests	50.89% <ø> (ø)
unit-tests	?
unit-tests-macos-latest	49.37% <ø> (?)
unit-tests-ubuntu-latest	50.87% <ø> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pkg/docker/docker_client_nonlinux.go	0.00% <0.00%> (ø)
pkg/docker/docker_client.go	84.87% <0.00%> (+23.52%)	⬆️

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[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: lance, lkingland

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