Porter config file doesn't always bind to the command flag

[carolynvs]

Describe the bug

When running a porter command that has a flag is defined, and that setting is not globally defined on config.DataStore, configuring the flag in your porter config file doesn't work. Only environment variables and directly setting the flag works.

Context

• DataStore is reserved for settings that are not exposed on command flags, and should only be defined for settings such as the current secrets plugin.
• The root cause is that we are binding viper config values to the cobra flags too early, before the config file has been loaded.

To Reproduce

Let's pick a flag that is defined on a command that doesn't have a global setting, such as porter build --no-lint.

1. Create a bundle
2. Edit the install action with the snippet below which normally triggers a lint error

    install:
      - exec:
          description: quotes are for suckers
          command: bash
          flags:
            c: echo "Hello World"

3. Run porter build --no-lint=true and note that the build is stopped with a lint error.
4. Run porter build --no-lint=false and note that the build is allowed to execute.
5. Now edit your ~/.porter/config.yaml and add a line with no-lint: true.
6. Run porter build without specifying the --no-lint flag. Note that the linter is still executed and the build is stopped with a lint error.

Expected behavior

The configuration file should automatically set --no-lint to true and the build should be allowed to proceed.

Porter Command and Output

$ porter build
warning(exec-100) - Best Practice: Avoid Embedded Bash
install: 1st step in the exec mixin (quotes are for suckers)
See https://getporter.org/best-practices/exec-mixin/#use-scripts for more information
---
error(exec-101) - bash -c argument missing wrapping quotes
install: 1st step in the exec mixin (quotes are for suckers)
The bash -c flag argument must be wrapped in quotes, for example
exec:
  description: Say Hello
  command: bash
  flags:
    c: '"echo Hello World"'

See https://getporter.org/best-practices/exec-mixin/#quoting-escaping-bash-and-yaml for more information
---

lint errors were detected. Rerun with --no-lint ignore the errors

Version

1.0.13