feat(sg): update appliance images (sourcegraph#64512)

Relates to
https://linear.app/sourcegraph/issue/REL-322/appliance-helm-chart-should-be-versioned
but does not close it.

See test plan in
sourcegraph/deploy-sourcegraph-helm#534

Author: Craig Furman

dev/ci/images/images.go

@@ -106,6 +106,8 @@ var SourcegraphDockerImagesTestDeps = []string{"server", "executor"}
 var DeploySourcegraphDockerImages = []string{
 	"alpine-3.14",
 	"postgres-12-alpine",
+	"appliance",
+	"appliance-frontend",
 	"blobstore",
 	"caddy",
 	"cadvisor",