Add deploy hook feature (#33)

Author: user-name-beta

README.md

@@ -62,6 +62,7 @@ The following environment variables can be used to customize the Certbot contain
 | `CERTBOT_EMAIL`        | Email address for Let's Encrypt notifications                       | - |
 | `CERTBOT_KEY_TYPE`     | Type of private key to generate                                     | `ecdsa` |
 | `CERTBOT_SERVER`       | The ACME server URL                                                 | `https://acme-v02.api.letsencrypt.org/directory` |
+| `CERTBOT_DEPLOY_HOOK`  | A command to run after obtaining the certificate          | - |
 | `CLOUDFLARE_API_TOKEN` | Cloudflare API token for DNS authentication (see below how to create one)                         | - |
 | `CLOUDFLARE_CREDENTIALS_FILE` | Path to the Cloudflare credentials file. | `/cloudflare.ini` |
 | `CLOUDFLARE_PROPAGATION_SECONDS` | Wait time (in seconds) after setting DNS TXT records before validation. Useful if DNS propagation is slow. | `10` |

src/entrypoint.sh

@@ -114,6 +114,10 @@ run_certbot() {
         set -- "$@" --expand
     fi
 
+    if [ -n "$CERTBOT_DEPLOY_HOOK" ]; then
+        set -- "$@" --deploy-hook "$CERTBOT_DEPLOY_HOOK"
+    fi
+
     # Run certbot command
     $certbot_cmd $debug_flag certonly \
         --dns-cloudflare \