Raspberry Pi install error: "curl failed to verify the legitimacy of the server ..."
### Analysis

Running through installation instructions for Raspberry Pi, running this line causes an error:

`curl -sSfL https://repo.homebridge.io/KEY.gpg | sudo gpg --dearmor | sudo tee /usr/share/keyrings/homebridge.gpg  > /dev/null
`

Error: 
```
curl failed to verify the legitimacy of the server and therefore could not
establish a secure connection to it. To learn more about this situation and
how to fix it, please visit the web page mentioned above.
gpg: no valid OpenPGP data found.
```



### Expected Behavior

curl command step should not error out.

### Steps To Reproduce

On Raspberry pi terminal, run the following line:

curl failed to verify the legitimacy of the server 

### Logs

```markdown
curl failed to verify the legitimacy of the server and therefore could not
establish a secure connection to it. To learn more about this situation and
how to fix it, please visit the web page mentioned above.
gpg: no valid OpenPGP data found.
```


### Configuration

```json
Raspberry Pi Zero
```


### Environment

- OS: Raspberry Pi OS
- Software: n/a
- Node: n/a
- npm: n/a


### Process Supervisor

not applicable

### Additional Context

The fix to this is to add the '-k' flag, to avoid strict checking of certificates.

`curl -k -sSfL https://repo.homebridge.io/KEY.gpg | sudo gpg --dearmor | sudo tee /usr/share/keyrings/homebridge.gpg  > /dev/null
`