Update integration tests to run at the current commit in CI

[emmastephenson]

PULL REQUEST

Summary

When running tests in CI, install from @{current_commit} instead of main.

Related Issue

This fixes an issue where a breaking SDK change for the containers is only discovered after merge to main. For instance:

1. An SDK change is made; integration tests pass locally and on CI (because they're installing PHDI from @main)
2. The SDK PR is merged into main
3. Container integration tests run and fail, because main@phdi now contains breaking changes.

Additional Information

This will only affect integration tests running in CI - local tests will still install from @main. (Warning here in case of future "it works on my machine")

CI before:

CI after:

Checklist

• If this code affects the other scrum team, have they been notified? (In Slack, as reviewers, etc.)

[codecov]

Codecov Report

Merging #871 (d6eba92) into main (9f9ad69) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #871   +/-   ##
=======================================
  Coverage   96.37%   96.37%           
=======================================
  Files          46       46           
  Lines        2648     2648           
=======================================
  Hits         2552     2552           
  Misses         96       96           

Flag	Coverage Δ
unit-tests	96.37% <ø> (ø)

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[DanPaseltiner]

Thanks @emmastephenson!