Fix dns resolution in base image

[richardcase]

With our current base image we have issues with DNS resolution. Our base image is using systemd/systemd-resolvd and this requires that /etc/resolv.conf be symlinked to /run/systemd/resolve/stub-resolv.conf . However, when using docker/buildkit/kaniko its not possible to make changes to resolv.conf as this is treated specially.

We are working around this issue temporarily by using bootcmd in cloud-init to run ln -sf /run/systemd/resolve/stub-resolv.conf /etc/resolv.conf when flintlock is called from capmvm.

However, we need a long term solution where the container image is setup correctly for dns resolution.