faas-cli

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Lucas Roesler b65e279f9f feat: Add missing fields to the describe output

Add the function
* constraints
* environment variables
* secrets
* requests and limits

This can be tested as follows:

Create a test cluster using KinD

```sh
kind create cluster --config=cluster.yaml
arkade install openfaas -a=false --function-pull-policy=IfNotPresent --wait

faas-cli store deploy nodeinfo --annotation sample=true --label status=418
```

Now deploy a sample function

```sh
$ faas-cli describe nodeinfo
Name:                nodeinfo
Status:              Ready
Replicas:            1
Available replicas:  1
Invocations:         0
Image:               ghcr.io/openfaas/nodeinfo:latest
Function process:    <default>
URL:                 http://127.0.0.1:8080/function/nodeinfo
Async URL:           http://127.0.0.1:8080/async-function/nodeinfo
Labels               faas_function : nodeinfo
                     status : 418
Annotations          sample : true
                     prometheus.io.scrape : false
Constraints          <none>
Environment          <none>
Secrets              <none>
Requests             <none>
Limits               <none>

```

Now we add some more interesting values, like a secret and env variables.

```sh
$ faas-cli secret create db-password --from-literal=password
Creating secret: db-password.
Created: 202 Accepted

$ faas-cli store deploy nodeinfo --annotation sample=true --label status=418 --secret db-password --env db-user=postgres --env db-host=rds.aws.example.com

Deployed. 202 Accepted.
URL: http://127.0.0.1:8080/function/nodeinfo

$ faas-cli describe nodeinfo
Name:                nodeinfo
Status:              Ready
Replicas:            1
Available replicas:  1
Invocations:         0
Image:               ghcr.io/openfaas/nodeinfo:latest
Function process:    <default>
URL:                 http://127.0.0.1:8080/function/nodeinfo
Async URL:           http://127.0.0.1:8080/async-function/nodeinfo
Labels:              faas_function: nodeinfo
                     status: 418
                     uid: 736815901
Annotations:         prometheus.io.scrape: false
                     sample: true
Constraints:         <none>
Environment:         <none>
Secrets:              - db-password
Requests:            <none>
Limits:              <none>
```

To see how multiple Secrets and the Requests and Limits are rendered, use

```yaml
version: 1.0
provider:
  name: openfaas
  gateway: http://127.0.0.1:8080
functions:
  nodeinfo:
    lang: Dockerfile
    image: ghcr.io/openfaas/nodeinfo:latest
    secrets:
      - cache-password
      - db-password
    environment:
      db-host: rds.aws.example.com
      cache-host: redis.aws.example.com
    labels:
      status: 481
    annotations:
      sample: "true"
    requests:
      cpu: 100m
      memory: 128Mi
    limits:
      cpu: 200m
      memory: 256Mi
```
then

```sh
$ faas-cli secret create cache-password --from-literal=password
Creating secret: cache-password.
Created: 202 Accepted
$ faas-cli deploy
Deploying: nodeinfo.

Deployed. 202 Accepted.
URL: http://127.0.0.1:8080/function/nodeinfo

$ faas-cli describe nodeinfo
Name:                nodeinfo
Status:              Ready
Replicas:            1
Available replicas:  1
Invocations:         0
Image:               ghcr.io/openfaas/nodeinfo:latest
Function process:    <default>
URL:                 http://127.0.0.1:8080/function/nodeinfo
Async URL:           http://127.0.0.1:8080/async-function/nodeinfo
Labels:              faas_function: nodeinfo
                     status: 481
                     uid: 679245186
Annotations:         prometheus.io.scrape: false
                     sample: true
Constraints:         <none>
Environment:         <none>
Secrets:             - cache-password
                     - db-password
Requests:            CPU: 100m
                     Memory: 128Mi
Limits:              CPU: 200m
                     Memory: 256Mi
```

Signed-off-by: Lucas Roesler <roesler.lucas@gmail.com>