Make VelaD fully air-gapped in darwin/arm64

[chivalryq]

There are several things to do. If it goes successfully, we can make VelaD fully air-gapped in all supported platforms in next patch version (v1.7.x).

Dependency:

• oam-dev/cluster-gateway fix the release CI and provide arm64 Make release CI more robust oam-dev/cluster-gateway#126 （Have a fix in v1.7.0)

VelaD:

• Use the correct forked modules. Fix: wrongly replaced k3d modules #110
  images.
• Remove the skipping loading image when run in darwin/arm64.
• Add a e2e test for air-gapped installation. This can be implemented by passing: --set image.pullPolicy=Never --set admissionWebhooks.patch.image.pullPolicy=Never --set multicluster.clusterGateway.image.pullPolicy=Never to velad install Feat: add argument to e2e for testing air-gap installation capability #120

related issue: #64

[chivalryq]

Now the VelaD is fully air-gapped for darwin/arm64. Will close this issue after next release.

[chivalryq]

v1.7.1 released