Enable loading Secret Store configuration through environment variables

Author: harmony7

pkg/manifest/file.go

@@ -127,6 +127,9 @@ func (f *File) MarshalTOML() ([]byte, error) {
 					if e.Data != "" {
 						obj["data"] = e.Data
 					}
+					if e.Env != "" {
+						obj["env"] = e.Env
+					}
 					items = append(items, obj)
 				}
 				secretStores[key] = items

pkg/manifest/local_server.go

@@ -119,6 +119,7 @@ type SecretStoreArrayEntry struct {
 	Key  string `toml:"key"`
 	File string `toml:"file,omitempty"`
 	Data string `toml:"data,omitempty"`
+	Env  string `toml:"env,omitempty"`
 }
 
 // SecretStoreExternalFile represents the external key/value store,

pkg/manifest/testdata/fastly-viceroy-update.toml

@@ -71,3 +71,7 @@ data = "This is also some secret data"
 [[local_server.secret_stores.store_two]]
 key = "second"
 file = "/path/to/other/secret.json"
+
+[[local_server.secret_stores.store_two]]
+key = "fourth"
+env = "ENV_FOURTH"