Cloud Build: Fix substitutions. #373

Job	Run time
changes	4s
e2e-test-echo	0s
opentelemetry (1.25.3)	6m 27s
kube-webhook-certgen (v1.26.15)	2m 35s
nginx125	0s
opentelemetry (1.21.6)	6m 7s
kube-webhook-certgen (v1.27.13)	2m 33s
kube-webhook-certgen (v1.28.9)	2m 29s
kube-webhook-certgen (v1.29.4)	2m 35s
kube-webhook-certgen (v1.30.0)	2m 32s
cfssl / changestag	3s
cfssl / Build	16s
custom-error-pages / changestag	4s
custom-error-pages / Build	28s
ext-auth-example-authsvc / changestag	5s
ext-auth-example-authsvc / Build	20s
fastcgi-helloserver / changestag	3s
fastcgi-helloserver / Build	20s
go-grpc-greeter-server / changestag	5s
go-grpc-greeter-server / Build	31s
httpbun / changestag	4s
httpbun / Build	27s
cfssl / Push	0s
httpbun / Push	0s
fastcgi-helloserver / Push	0s
custom-error-pages / Push	0s
ext-auth-example-authsvc / Push	0s
go-grpc-greeter-server / Push	0s
	28m 8s

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