releng-ci: Build v0.3.0 image (using go1.16rc1)
releng-ci: Build v0.3.0 image (using go1.16rc1)

Signed-off-by: Stephen Augustus <0beec7b5ea3f0fdbc95d0dd47f3c5bc275da8a33@auggie.dev>

kubernetes/release,kubernetes/release