Update charm documentation to mention required external access (#59) #21

Job	Run time
publish-to-edge / Get images	5s
publish-to-edge / Get images	5s
publish-to-edge / branch-up-to-date-check-enabled	2s
publish-to-edge / branch-up-to-date-check-enabled	2s
publish-to-edge / Get runner image / Get runner image	3s
publish-to-edge / Get runner image / Get runner image	3s
publish-to-edge / Release charm libs	4s
publish-to-edge / Release charm libs	4s
publish-to-edge / Draft publish docs	45s
publish-to-edge / Draft publish docs	45s
publish-to-edge / Get workflow run id	4s
publish-to-edge / Get workflow run id	4s
publish-to-edge / Publish images to charmhub	3m 30s
publish-to-edge / Publish images to charmhub	1m 11s
publish-to-edge / Publish charm to ${{ inputs.channel }}	0s
publish-to-edge / Publish charm to latest/edge	2m 21s
	9m 8s

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