support creating secrets from file contents

[sethpollack]

For example:

secretGenerator:
- name: secret-in-base
  behavior: merge
  commands:
    - type: env
      command: "blackbox_cat secret.env"    
    - type: yaml
      command: "sops -d secret.yaml"    
    - type: json
      command: "cat secret.json"    
    - type: inline
      hello: "echo world"    

[sethpollack]

or something like this

secretGenerator:
- name: app-tls
  literals:
   - tls.crt="cat secret/tls.cert"
   - tls.key="cat secret/tls.key"
  env: cat more.env

[knqyf263]

Thank you for this awesome tool!
Is there any progress in this issue?

If you need a developer, I will help.