Allow `k8s` to integrate with multiple worker units (#221) #124

Job	Run time
charmcraft-channel	2s
configure-channel	1s
publish-to-edge (./charms/worker/, k8s-worker, arm64) / select-channel	2s
publish-to-edge (./charms/worker/k8s/, k8s, amd64) / select-channel	7s
publish-to-edge (./charms/worker/k8s/, k8s, arm64) / select-channel	7s
publish-to-edge (./charms/worker/, k8s-worker, amd64) / select-channel	2s
publish-to-edge (./charms/worker/, k8s-worker, arm64) / Publish charm to latest/edge	44s
publish-to-edge (./charms/worker/, k8s-worker, amd64) / Publish charm to latest/edge	53s
publish-to-edge (./charms/worker/k8s/, k8s, amd64) / Publish charm to latest/edge	41s
publish-to-edge (./charms/worker/k8s/, k8s, arm64) / Publish charm to latest/edge	48s
publish-to-edge (./charms/worker/, k8s-worker, arm64) / Release charm libs	3s
publish-to-edge (./charms/worker/, k8s-worker, arm64) / Draft publish docs	19s
publish-to-edge (./charms/worker/k8s/, k8s, amd64) / Draft publish docs	18s
publish-to-edge (./charms/worker/k8s/, k8s, amd64) / Release charm libs	46s
publish-to-edge (./charms/worker/, k8s-worker, amd64) / Draft publish docs	16s
publish-to-edge (./charms/worker/, k8s-worker, amd64) / Release charm libs	3s
publish-to-edge (./charms/worker/k8s/, k8s, arm64) / Draft publish docs	21s
publish-to-edge (./charms/worker/k8s/, k8s, arm64) / Release charm libs	42s
	6m 15s

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