added ssh key management resource

examples/resources/gitea_public_key/id_ed25519.pub

@@ -0,0 +1 @@
+ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAINn6hAP48oKz6MVWjYvn0fne2YeaOv/zC6zuvFXlJKf2 test@dev.local

examples/resources/gitea_public_key/resource.tf

@@ -0,0 +1,14 @@
+resource "gitea_user" "test" {
+  username             = "test"
+  login_name           = "test"
+  password             = "Geheim1!"
+  email                = "test@user.dev"
+  must_change_password = false
+}
+
+
+resource "gitea_public_key" "test_user_key" {
+  title     = "test"
+  key       = file("${path.module}/id_ed25519.pub")
+  username  = gitea_user.test.username
+}