Environment variables passed via -e flag not applied on deploy

Environment variables passed with `func deploy -e KEY=VALUE` are not
included in the deployed service spec. They work correctly with
`func run -e`, but on deploy the env vars are missing from the
container spec.

Expected: `-e MYVAR=value` on deploy sets the env var in the Knative
service container spec, the same way it does for local runs.

Related: [SRVOCF-650](https://redhat.atlassian.net/browse/SRVOCF-650)

Start with the `func deploy -e KEY=VALUE` path and compare it with the existing `func run -e` handling. Trace where deployment builds the Knative service container spec; done means deploy includes the supplied environment variables in that spec, matching local-run behavior.

Written by the indexing model from the issue text.