docs: add passphrase example

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>

DOCS.md

@@ -139,6 +139,23 @@ Example configuration for stoping script after first failure:
         - echo "you can't see the steps."
 ```
 
+Example configuration for passphrase which protecting a private key:
+
+```diff
+  - name: ssh commands
+    image: appleboy/drone-ssh
+    settings:
+      host: foo.com
+      username: root
++     key:
++       from_secret: ssh_key
++     passphrase: 1234
+      port: 22
+      script:
+        - mkdir abc/def/efg
+        - echo "you can't see the steps."
+```
+
 ## Secret Reference
 
 ssh_username
@@ -147,6 +164,9 @@ ssh_username
 ssh_password
 : password for target host user
 
+ssh_passphrase
+: The purpose of the passphrase is usually to encrypt the private key.
+
 ssh_key
 : plain text of user private key
 
@@ -156,6 +176,9 @@ proxy_ssh_username
 proxy_ssh_password
 : password for user of proxy server
 
+proxy_ssh_passphrase
+: The purpose of the passphrase is usually to encrypt the private key.
+
 proxy_ssh_key
 : plain text of user private key for proxy server
 

main.go

@@ -40,7 +40,7 @@ func main() {
 		},
 		cli.StringFlag{
 			Name:   "ssh-passphrase",
-			Usage:  "ssh passphrase",
+			Usage:  "The purpose of the passphrase is usually to encrypt the private key.",
 			EnvVar: "PLUGIN_SSH_PASSPHRASE,PLUGIN_PASSPHRASE,SSH_PASSPHRASE,PASSPHRASE,INPUT_PASSPHRASE",
 		},
 		cli.StringFlag{
@@ -109,7 +109,7 @@ func main() {
 		},
 		cli.StringFlag{
 			Name:   "proxy.ssh-passphrase",
-			Usage:  "proxy ssh passphrase",
+			Usage:  "The purpose of the passphrase is usually to encrypt the private key.",
 			EnvVar: "PLUGIN_PROXY_SSH_PASSPHRASE,PLUGIN_PROXY_PASSPHRASE,PROXY_SSH_PASSPHRASE,PROXY_PASSPHRASE,INPUT_PROXY_PASSPHRASE",
 		},
 		cli.StringFlag{