3261: Fix alternate SSO endpoint configuration.
3261: Fix condition for showing SSH usage message.
3261: Add Keep blob_signing_key configuration.
3261: Propagate configured RAILS_ENV to Workbench build tasks.

Without this, the rake assets:precompile task defaults to development
mode and does nothing.
3261: Fix wrong test: wanted file size == 0, not string length == 0.
3261: Strip .in from list of generated files.
3261: fixes for Docker build process

* New tool list_generated_files avoids difficult quoting/escaping
  problems in Makefile

* keep/Dockerfile fixes permissions on /usr/local/bin/run-keep

Refs #3261.
3261: Improve status reporting
3261: Fix permissions on run-keep script
Merge remote-tracking branch 'origin/3261-keep-docker-config' into 3261-keep-docker-config
3261: Fix wrong test: wanted file size == 0, not file size != 0.
3261: Fix wrong variable.
3261: Fix typo.
3261: Restore (and document) ability to use docker sso container.
3261: Turn on --enforce-permissions in run-keep.
3261: Reduce dependency bloat: process templates one dir at a time.
3261: simplify Makefile
Merge branch 'master' into 3261-keep-docker-config
Merge branch '3261-keep-docker-config'

refs #3261