Configuring data/env in Application

vela provides a config command to manage config data.

`vela config set`

$ vela config set test a=b c=d
reading existing config data and merging with user input
config data saved successfully ✅

`vela config get`

$ vela config get test
Data:
  a: b
  c: d

`vela config del`

$ vela config del test
config (test) deleted successfully

`vela config ls`

$ vela config set test a=b
$ vela config set test2 c=d
$ vela config ls
NAME
test
test2

Configure env in application

The config data can be set as the env in applications.

$ vela config set demo DEMO_HELLO=helloworld

Save the following to vela.yaml in current directory:

name: testapp
services:
  env-config-demo:
    image: heroku/nodejs-hello-world
    config: demo

Then run:

$ vela up
Parsing vela.yaml ...
Loading templates ...
Rendering configs for service (env-config-demo)...
Writing deploy config to (.vela/deploy.yaml)
Applying deploy configs ...
Checking if app has been deployed...
App has not been deployed, creating a new deployment...
✅ App has been deployed 🚀🚀🚀
    Port forward: vela port-forward testapp
             SSH: vela exec testapp
         Logging: vela logs testapp
      App status: vela status testapp
  Service status: vela status testapp --svc env-config-demo

Check env var:

$ vela exec testapp -- printenv | grep DEMO_HELLO
DEMO_HELLO=helloworld