feat: support secret and encrypted environment variables in v1

PiperOrigin-RevId: 499338464

google/cloud/batch/v1/task.proto

@@ -291,6 +291,23 @@ message Task {
 // An Environment describes a collection of environment variables to set when
 // executing Tasks.
 message Environment {
+  message KMSEnvMap {
+    // The name of the KMS key that will be used to decrypt the cipher text.
+    string key_name = 1;
+
+    // The value of the cipherText response from the `encrypt` method.
+    string cipher_text = 2;
+  }
+
   // A map of environment variable names to values.
   map<string, string> variables = 1;
+
+  // A map of environment variable names to Secret Manager secret names.
+  // The VM will access the named secrets to set the value of each environment
+  // variable.
+  map<string, string> secret_variables = 2;
+
+  // An encrypted JSON dictionary where the key/value pairs correspond to
+  // environment variable names and their values.
+  KMSEnvMap encrypted_variables = 3;
 }