Enable generating endpoints with paths and exposing job ports.

[njhale]

Add a path field to container ports so that users can specify an
optional path to append to container's endpoint URL. The path field
supports interpolation which, for example, enables the use of runtime
generated tokens.

Additionally, deploy ServiceInstances and Ingresses for job ports. This
allows jobs to serve traffic and expose things like temporary web pages
for collecting user credentials.

e.g. Adding a port with an interpolated path to a job:

jobs: ahoy: {
	build: "."
	ports: publish: [
		{
			targetPort: 9000
			protocol:   "http"
			path:       "/ahoy?token=@{secrets.token-ahoy.token}"
		},
	]
}


secrets: {
	"token-ahoy": type: "token"
}

Will result in an app endpoint that stays active until the job completed (or the app is stopped)

NAME        IMAGE          COMMIT         CREATED    ENDPOINTS                                                                                                                 MESSAGE
cupule-j5   b831b259b470   ffaa36e7e2a2   32s ago    http://ahoy-job-cupule-j5-0ce4c978.local.oss-acorn.io/ahoy?token=bsgqt4bv75wm9sj85rldnv69m7bjsh6qrttqv9h8vw7w9g8nr6k7zt   (job: ahoy): job running

NAME        IMAGE          COMMIT         CREATED     ENDPOINTS   MESSAGE
cupule-j5   b831b259b470   ffaa36e7e2a2   2m50s ago               OK

[thedadams]

Looks good. Great job!