Convert legacy docker tests from bash to golang

[dereknola]

Background

The current docker tests use a complex series of bash function hooks to construct k3s cluster out of docker containers, using the rancher/k3s image we publish. These tests are difficult to read, difficult to write, and do not match the ginkgo/gomega centric BDD testing frameworks we have constructed for integration and E2E tests.

Proposed Changes

• Convert the old docker tests to use Ginkgo/Gomega BDD testing framework. This framework is currently similar but separate from E2E and Integration frameworks. Future work is to potentially combine all 3 frameworks where it makes sense.
• Precompile Go tests binaries during a separate build job to speed of the actual running of the tests. This runs in parallel with the Building of the k3s binary and image, which is the current bottleneck.

• compat test is now skew test, as we are testing the skew policy of K8s.

Note: For now this is going to exist alongside the legacy docker tests. More work needs to be done to ensure things like log output and failures are handled effectively.

Types of Changes

Major CI change, Testing

Verification

Testing

Linked Issues

TBD

User-Facing Change

Further Comments

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 42.37%. Comparing base (cd4dded) to head (66340b3).
Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #11357      +/-   ##
==========================================
- Coverage   47.18%   42.37%   -4.81%     
==========================================
  Files         179      179              
  Lines       18600    18600              
==========================================
- Hits         8776     7882     -894     
- Misses       8469     9512    +1043     
+ Partials     1355     1206     -149     

Flag	Coverage Δ
e2etests	34.27% <ø> (-7.94%)	⬇️
inttests	18.82% <ø> (-15.87%)	⬇️
unittests	13.82% <ø> (ø)

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

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

---

🚨 Try these New Features:

• Flaky Tests Detection - Detect and resolve failed and flaky tests