Add diff script for compositon functions #1913

Job	Run time
linting (lint_jsonnet)	8s
golden (defaults)	24s
test (defaults)	24s
linting (lint_yaml)	41s
golden (exoscale)	25s
test (exoscale)	24s
linting (lint_adoc)	6s
golden (cloudscale)	26s
test (cloudscale)	26s
golden (openshift)	31s
test (openshift)	30s
golden (vshn)	34s
test (vshn)	36s
golden (apiserver)	23s
test (apiserver)	23s
golden (controllers)	24s
test (controllers)	22s
golden (minio)	24s
test (minio)	24s
golden (cloudscale-metrics-collector-cloud)	24s
test (cloudscale-metrics-collector-cloud)	24s
golden (cloudscale-metrics-collector-managed)	23s
test (cloudscale-metrics-collector-managed)	23s
golden (exoscale-metrics-collector-cloud)	23s
test (exoscale-metrics-collector-cloud)	27s
golden (exoscale-metrics-collector-managed)	23s
test (exoscale-metrics-collector-managed)	23s
	11m 5s

Provide feedback