docs: update readme

README.md

@@ -25,15 +25,26 @@ action "Copy multiple file" {
 }
 ```
 
+## Environment variables
+
+* HOST - ssh server host
+* PORT - ssh server port
+* USERNAME - ssh server username
+* PASSWORD - ssh server password
+* KEY - ssh server private key
+* TARGET - target folder
+* SOURCE - scp file list
+
 ### Example
 
+Copy file via ssh password
+
 ```
 action "Copy multiple file" {
   uses = "appleboy/scp-action@master"
   env = {
     HOST = "example.com"
     USERNAME = "foo"
-    PASSWORD = "bar"
     PORT = "22"
     SOURCE = "tests/a.txt,tests/b.txt"
     TARGET = "/home/foo/test"
@@ -43,3 +54,44 @@ action "Copy multiple file" {
   ]
 }
 ```
+
+Copy file via ssh key
+
+```
+action "Copy file via ssh key" {
+  uses = "appleboy/scp-action@master"
+  env = {
+    HOST = "example.com"
+    USERNAME = "foo"
+    PORT = "22"
+    SOURCE = "tests/c.txt,tests/d.txt"
+    TARGET = "/home/actions/test"
+  }
+  secrets = [
+    "KEY",
+  ]
+}
+```
+
+Example configuration for ignore list:
+
+```
+action "reqular expression list" {
+  uses = "appleboy/scp-action@master"
+  env = {
+    HOST = "example.com"
+    USERNAME = "foo"
+    PORT = "22"
+    SOURCE = "tests/*.txt,!tests/a.txt"
+    TARGET = "/home/actions/test"
+  }
+  secrets = [
+    "KEY",
+  ]
+}
+```
+
+## Secrets
+
+* `PASSWORD` - ssh server password
+* `KEY` - ssh server private key