backport(fix): free disk space in runner (#519) #1154

Job	Run time
Run Tests / Integration Test (1.25-strict/stable, integration)	13m 55s
Run Tests / Integration Test (1.25-strict/stable, integration-tls-provider)	13m 46s
Run Tests / Observability Integration Test (1.25-strict/stable)	15m 3s
Publish Charm / Generate the Charm Matrix	4s
Run Tests / Integration Test (1.25-strict/stable, integration-tls-secret)	13m 55s
Run Tests / Observability Integration Test (1.26-strict/stable)	15m 32s
Run Tests / Lint Code (pilot)	22s
Run Tests / Integration Test (1.26-strict/stable, integration)	13m 28s
Run Tests / Lint Code (gateway)	21s
Run Tests / Integration Test (1.26-strict/stable, integration-tls-provider)	13m 55s
Run Tests / Unit Test (pilot)	40s
Run Tests / Integration Test (1.26-strict/stable, integration-tls-secret)	13m 53s
Run Tests / Unit Test (gateway)	28s
Run Tests / Check libraries (istio-gateway) / Check libraries	5s
Run Tests / Check libraries (istio-gateway) / Lint	9s
Run Tests / Check libraries (istio-pilot) / Check libraries	31s
Run Tests / Check libraries (istio-pilot) / Lint	9s
Publish Charm / Publish Charm (./charms/istio-pilot)	40m 51s
Publish Charm / Publish Charm (./charms/istio-gateway)	15m 25s
	2h 52m 32s

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