Manage iOS code signing certificates

## Usage

`circleci certificate <command> [flags]`

## General Commands

| Command | Description                    |
| ------- | ------------------------------ |
| `list`  | List uploaded iOS certificates |

## Targeted Commands

| Command  | Description               |
| -------- | ------------------------- |
| `delete` | Delete an iOS certificate |
| `upload` | Upload a .p12 certificate |

## Flags

Global flags: `-c, --config`, `--debug`, `--no-color`, `-q, --quiet` — see `circleci --help`.

## Details

Upload, list, and delete Apple .p12 code signing certificates stored in
your CircleCI organization's secure storage.

Certificates are referenced by ID from a signing config. Deleting a
certificate that is referenced by a signing config will invalidate that
signing config.

