### 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
return self.type == 'dir'
    @property
    def namespace_collection_paths(self):
        return [
            to_native(path)
            for path in _find_collections_in_subdirs(self.src)
        ]
    @property
    def is_subdirs(self):
        return self.type == 'subdirs'
    @property
    def is_url(self):
        return self.type == 'url'
    @property
    def is_scm(self):
        return self.type == 'git'
    @property
    def is_concrete_artifact(self):
        return self.type in {'git', 'url', 'file', 'dir', 'subdirs'}
    @property
    def is_online_index_pointer(self):
        return not self.is_concrete_artifact
    @property
    def source_info(self):
        return self._source_info
RequirementNamedTuple = namedtuple('Requirement', ('fqcn', 'ver', 'src', 'type', 'signature_sources'))  # 
CandidateNamedTuple = namedtuple('Candidate', ('fqcn', 'ver', 'src', 'type', 'signatures'))  # 
class Requirement(