debug: change base for integration tests #1104

Job	Run time
Publish Charm / Generate the Charm Matrix	5s
Run Tests / Observability Integration Test (1.25-strict/stable)	10m 45s
Run Tests / Integration Test (1.25-strict/stable, integration)	8m 53s
Run Tests / Observability Integration Test (1.26-strict/stable)	11m 8s
Run Tests / Integration Test (1.25-strict/stable, integration-tls-provider)	8m 51s
Run Tests / Lint Code (pilot)	21s
Run Tests / Lint Code (gateway)	22s
Run Tests / Unit Test (pilot)	38s
Run Tests / Integration Test (1.25-strict/stable, integration-tls-secret)	8m 56s
Run Tests / Unit Test (gateway)	29s
Run Tests / Integration Test (1.26-strict/stable, integration)	8m 50s
Run Tests / Integration Test (1.26-strict/stable, integration-tls-provider)	8m 32s
Run Tests / Integration Test (1.26-strict/stable, integration-tls-secret)	8m 53s
Run Tests / Check libraries (istio-gateway) / Check libraries	3s
Run Tests / Check libraries (istio-gateway) / Lint	12s
Run Tests / Check libraries (istio-pilot) / Check libraries	28s
Run Tests / Check libraries (istio-pilot) / Lint	9s
Publish Charm / Publish Charm (./charms/istio-pilot)	39m 41s
Publish Charm / Publish Charm (./charms/istio-gateway)	15m 20s
	2h 12m 36s

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