On `docker build` and `docker pull` commands, display a hint to
`docker scout quickview`.
Hints are disabled if quiet flag is used or if `DOCKER_SCOUT_HINTS`
environment variable is set to a false (according to Go) value:
  `0`, `f`, `F`, `false`, `FALSE`, `False`

In case of a `docker build` the `docker scout quickview` command doesn't
need an argument as it will take the most recently built image by
default.
In case of a `docker pull` the pulled image is extracted from the
command arguments.

Signed-off-by: Yves Brissaud <[email protected]>

Signed-off-by: Yves Brissaud <[email protected]>

only display the hints in main case, without progress, output or push
flags

Signed-off-by: Yves Brissaud <[email protected]>

- cliHints entry in config.json
- if not present, enabled by default
- can be overridden by the DOCKER_CLI_HINTS environment variable

Signed-off-by: Yves Brissaud <[email protected]>

Signed-off-by: Yves Brissaud <[email protected]>

To avoid any conflict with the CLI, use the `plugins` section of the
config. This section is read and saved by the CLI without the risk to
remove the value in there. So it's a safe way to deal with this feature.

As it's a cross plugin configuration (now for scout but goal is wider
than that) then put it under a generic `-x-cli-hints` name so that other
plugins might use it if needed.

Value can be true/false, but is parsed against these exact two values
instead of using the ParseBool.

Both the environment variable and the config value are parsed the same
way.

Signed-off-by: Yves Brissaud <[email protected]>

Signed-off-by: Yves Brissaud <[email protected]>

the same way we check --progress flag, if it exists, disable

Signed-off-by: Yves Brissaud <[email protected]>

feat: display docker scout hints on build and pull