### Summary

If a galaxy requirements file contains collections that have signatures defined, then `ansible-galaxy role install` with that requirements file fails because a keyring is not supplied.

### Issue Type

Bug Report

### Component Name

ansible-galaxy

### Ansible Version

```console
$ ansible --version

ansible [core 2.13.0.dev0] (devel ff184b0815) last updated 2022/03/24 16:21:31 (GMT -400)
  config file = /home/shrews/.ansible.cfg
  configured module search path = ['/home/shrews/.ansible/plugins/modules', '/usr/share/ansible/plugins/modules']
  ansible python module location = /home/shrews/Devel/github/Shrews/ansible/lib/ansible
  ansible collection location = /home/shrews/.ansible/collections:/usr/share/ansible/collections
  executable location = /home/shrews/Devel/github/Shrews/ansible/bin/ansible
  python version = 3.9.7 (default, Sep 10 2021, 14:59:43) [GCC 11.2.0]
  jinja version = 3.1.0
  libyaml = True
```


### Configuration

```console
$ ansible-config dump --only-changed

DEFAULT_HOST_LIST(/home/shrews/.ansible.cfg) = ['/home/shrews/Devel/ansible/hosts.yaml']
```


### OS / Environment

Ubuntu 21.10

### Steps to Reproduce

<!--- Paste example playbooks or commands between quotes below -->
```yaml (paste below)

$ cat req.yml 
collections:
  - name: community.mysql
    signatures:
      - file:///home/shrews/test.asc

$ ansible-galaxy role install -r req.yml 
ERROR! Signatures were provided to verify community.mysql but no keyring was configured.
```


### Expected Results

`role install` should ignore collection signatures

### Actual Results

```console
$ ansible-galaxy role install -r req.yml -vvvv

ansible-galaxy [core 2.13.0.dev0] (devel ff184b0815) last updated 2022/03/24 16:21:31 (GMT -400)
  config file = /home/shrews/.ansible.cfg
  configured module search path = ['/home/shrews/.ansible/plugins/modules', '/usr/share/ansible/plugins/modules']
  ansible python module location = /home/shrews/Devel/github/Shrews/ansible/lib/ansible
  ansible collection location = /home/shrews/.ansible/collections:/usr/share/ansible/collections
  executable location = /home/shrews/Devel/github/Shrews/ansible/bin/ansible-galaxy
  python version = 3.9.7 (default, Sep 10 2021, 14:59:43) [GCC 11.2.0]
  jinja version = 3.1.0
  libyaml = True
Using /home/shrews/.ansible.cfg as config file
Reading requirement file at '/home/shrews/req.yml'
ERROR! Signatures were provided to verify community.mysql but no keyring was configured.
```


### Code of Conduct

- [X] I agree to follow the Ansible Code of Conduct
b_dir_path = to_bytes(dir_path, errors='surrogate_or_strict')
    return os.path.isfile(os.path.join(b_dir_path, _GALAXY_YAML))
def _is_installed_collection_dir(dir_path):
    b_dir_path = to_bytes(dir_path, errors='surrogate_or_strict')
    return os.path.isfile(os.path.join(b_dir_path, _MANIFEST_JSON))
def _is_collection_dir(dir_path):
    return (
        _is_installed_collection_dir(dir_path) or
        _is_collection_src_dir(dir_path)
    )
def _find_collections_in_subdirs(dir_path):
    b_dir_path = to_bytes(dir_path, errors='surrogate_or_strict')
    subdir_glob_pattern = os.path.join(
        b_dir_path,
        
        b'*',  
    )
    for subdir in iglob(subdir_glob_pattern):
        if os.path.isfile(os.path.join(subdir, _MANIFEST_JSON)):
            yield subdir
        elif os.path.isfile(os.path.join(subdir, _GALAXY_YAML)):
            yield subdir
def _is_collection_namespace_dir(tested_str):
    return any(_find_collections_in_subdirs(tested_str))
def _is_file_path(tested_str):
    return os.path.isfile(to_bytes(tested_str, errors='surrogate_or_strict'))
def _is_http_url(tested_str):