Refactor YAML schema to support multiple authorized keys and known hosts (#463)

* add coverage for go proxy

* Refactor CLI flag name for allowed proxy addresses

* Refactor YAML schema to support multiple authorized keys and known hosts

* add testcases

* Refactor YAML schema to support multiple authorized keys and known hosts

* go fmt

* go fmt

plugin/yaml/yaml_test.go

@@ -0,0 +1,58 @@
+//go:build full || e2e
+
+package main
+
+import (
+	"testing"
+
+	"gopkg.in/yaml.v3"
+)
+
+const yamlConfigTemplate = `
+version: "1.0"
+pipes:
+- from:
+    - username: "password_simple"
+  to:
+    host: host-password:2222
+    username: "user"
+    ignore_hostkey: true
+- from:
+    - username: "password_.*_regex"
+      username_regex_match: true
+  to:
+    host: host-password:2222
+    username: "user"
+    known_hosts_data: 
+    - fDF8RjRwTmVveUZHVEVHcEIyZ3A4RGE0WlE4TGNVPXxycVZYNU0rWTJoS0dteFphcVFBb0syRHp1TEE9IHNzaC1lZDI1NTE5IEFBQUFDM056YUMxbFpESTFOVEU1QUFBQUlPTXFxbmtWenJtMFNkRzZVT29xS0xzYWJnSDVDOW9rV2kwZGgybDlHS0psCg==
+    - fDF8VzRpUUd0VFVyREJwSjM3RnFuOWRwcEdVRE5jPXxEZWFna2RwVHpZZDExdDhYWXlORnlhZmROZ2c9IHNzaC1lZDI1NTE5IEFBQUFDM056YUMxbFpESTFOVEU1QUFBQUlBZnVDSEtWVGpxdXh2dDZDTTZ0ZEc0U0xwMUJ0bi9uT2VISEU1VU96UmRmCg==
+- from:
+    - username: "publickey_simple"
+      authorized_keys: /tmp/auth_keys
+  to:
+    host: host-publickey:2222
+    username: "user"
+    private_key: /tmp/private_key
+    known_hosts_data: fDF8RjRwTmVveUZHVEVHcEIyZ3A4RGE0WlE4TGNVPXxycVZYNU0rWTJoS0dteFphcVFBb0syRHp1TEE9IHNzaC1lZDI1NTE5IEFBQUFDM056YUMxbFpESTFOVEU1QUFBQUlPTXFxbmtWenJtMFNkRzZVT29xS0xzYWJnSDVDOW9rV2kwZGgybDlHS0psCg==
+- from:
+    - username: ".*"
+      username_regex_match: true
+      authorized_keys: 
+      - /tmp/private_key1
+      - /tmp/private_key2
+  to:
+    host: host-publickey:2222
+    username: "user"
+    ignore_hostkey: true
+    private_key: /tmp/private_key
+`
+
+func TestYamlDecode(t *testing.T) {
+	var config piperConfig
+
+	err := yaml.Unmarshal([]byte(yamlConfigTemplate), &config)
+	if err != nil {
+		t.Fatalf("Failed to unmarshal yaml: %v", err)
+	}
+
+}