fix: use external_url in alert source (#635) #65

Job	Run time
release / Quality Checks / Check the CHARMHUB_TOKEN secret	1s
release / Quality Checks / Linting / Lint	13s
release / Quality Checks / Inclusive naming / check	5s
release / Quality Checks / Static Analysis / Static Analysis of Charm	26s
release / Quality Checks / Static Analysis / Static Analysis of Libs	20s
release / Quality Checks / Scenario Tests / Scenario tests	21s
release / Quality Checks / Unit Tests / Unit tests	32s
release / Quality Checks / Check libraries	27s
release / Quality Checks / CodeQL analysis / Analyze (python)	1m 44s
release / Quality Checks / Integration Tests / Integration Tests	59m 43s
release / Release any bumped charm library	27s
release / Release Charm and Libraries / Build the charms	14m 15s
release / Release Charm and Libraries / Build the charms for ARM	0s
release / Release Charm and Libraries / Release arm64 to CharmHub	0s
release / Release Charm and Libraries / Release to CharmHub (prometheus-k8s_ubuntu-20.04-amd64.charm)	1m 9s
release / Release Charm and Libraries / Charm List	0s
	1h 19m 43s

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