Support builds-on/runs-on arm (#94) #76

Job	Run time
configure-channel	2s
charmcraft-channel	5s
publish-to-edge (./charms/worker/k8s/, k8s, amd64) / select-channel	4s
publish-to-edge (./charms/worker/, k8s-worker, amd64) / select-channel	8s
publish-to-edge (./charms/worker/, k8s-worker, arm64) / select-channel	10s
publish-to-edge (./charms/worker/k8s/, k8s, arm64) / select-channel	5s
publish-to-edge (./charms/worker/k8s/, k8s, arm64) / Publish charm to latest/edge	49s
publish-to-edge (./charms/worker/k8s/, k8s, amd64) / Publish charm to latest/edge	54s
publish-to-edge (./charms/worker/, k8s-worker, amd64) / Publish charm to latest/edge	47s
publish-to-edge (./charms/worker/, k8s-worker, arm64) / Publish charm to latest/edge	1m 11s
publish-to-edge (./charms/worker/, k8s-worker, amd64) / Draft publish docs	25s
publish-to-edge (./charms/worker/, k8s-worker, amd64) / Release charm libs	5s
publish-to-edge (./charms/worker/k8s/, k8s, arm64) / Release charm libs	1m 20s
publish-to-edge (./charms/worker/k8s/, k8s, arm64) / Draft publish docs	38s
publish-to-edge (./charms/worker/k8s/, k8s, amd64) / Release charm libs	48s
publish-to-edge (./charms/worker/k8s/, k8s, amd64) / Draft publish docs	33s
publish-to-edge (./charms/worker/, k8s-worker, arm64) / Draft publish docs	24s
publish-to-edge (./charms/worker/, k8s-worker, arm64) / Release charm libs	6s
	8m 34s

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