Support repository regex rewrite rules when fetching image content.
Example configuration:
```yaml
# /etc/rancher/k3s/registries.yaml
mirrors:
"docker.io":
endpoint:
- "https://registry-1.docker.io/v2"
rewrite:
"^library/alpine$": "my-org/alpine"
```
This will instruct k3s containerd to fetch content for `alpine` images
from `docker.io/my-org/alpine` instead of the default
`docker.io/library/alpine` locations.
Signed-off-by: Jacob Blain Christen <jacob@rancher.com>
Because:
- Current CNI plugins produces an error on Raspbian:
`failed to create bridge \"cni0\": could not add \"cni0\": operation not supported"`
- Dependencies for CNI plugins may interfere with containerd dependencies.
This change will compile and download CNI plugins separately, and will
downgrade CNI plugins to v0.7.6 for compatability with armv7.
