Added the github action to run e2e tests against serving

[houshengbo]

Changes

• This PR added the e2e test framework into this repo.

/kind

Fixes #29

Release Note

Docs

[knative-prow]

@houshengbo: The label(s) kind/<kind> cannot be applied, because the repository doesn't have them.

In response to this:

• This PR added the e2e test framework into this repo.

/kind

Fixes #

Release Note

Docs

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[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: houshengbo

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[codecov]

Codecov Report

Merging #27 (6ba23ba) into main (95c9ff6) will not change coverage.
Report is 1 commits behind head on main.
The diff coverage is n/a.

❗ Current head 6ba23ba differs from pull request most recent head 80298ca. Consider uploading reports for the commit 80298ca to get more accurate results

@@           Coverage Diff           @@
##             main      #27   +/-   ##
=======================================
  Coverage   21.31%   21.31%           
=======================================
  Files           9        9           
  Lines          61       61           
=======================================
  Hits           13       13           
  Misses         48       48           

[yuzisun]

/lgtm