Title: How to Upload a New Certificate to Kong Using decK?

I’m trying to upload a new SSL certificate to Kong using decK, but I’m encountering an error. I can successfully upload certificates using the Kong Admin API, but the same approach doesn’t seem to work with decK.

What I’ve Tried:

1. Generated the Private Key and Certificate:

   I generated the private key and self-signed certificate using OpenSSL:

   openssl genrsa -out server.key.pem 2048
   openssl req -new -key server.key.pem -out server.csr.pem
   openssl x509 -req -days 365 -in server.csr.pem -signkey server.key.pem -out server.crt.pem
   

2. Created the YAML Configuration for decK:

   I prepared the kong.yml file with the certificate and key:

   _format_version: "2.1"
   _transform: true
   
   certificates:
     - cert: |
         -----BEGIN CERTIFICATE-----
         ...your certificate content...
         -----END CERTIFICATE-----
       key: |
         -----BEGIN RSA PRIVATE KEY-----
         ...your key content...
         -----END RSA PRIVATE KEY-----
       snis:
         - example.local
       tags:
         - example
   

3. Synced the Configuration with Kong:

   I used the following command to apply the configuration to my Kong instance:

   deck sync -s kong.yml
   

Issue:

When I run the deck sync command, I receive the following error:

```
err=certificates.0: id is required
```

However, the same certificate and key work when uploaded directly via the Kong Admin API using the following command:

```sh
curl -i -X POST http://localhost:8001/certificates 
  --data "cert=$(cat server.crt.pem)" 
  --data "key=$(cat server.key.pem)" 
  --data "snis[]=example.local" 
  --data "tags[]=example"
```

Question:

How can I successfully upload a new certificate to Kong using decK? Is there something I’m missing in my kong.yml configuration? Any help or guidance would be greatly appreciated!