Teach the manifest about dictionaries

pkg/commands/compute/manifest/manifest.go

@@ -216,7 +216,8 @@ type Mapper map[string]interface{}
 // LocalServer represents a list of backends that should be mocked as per the
 // configuration values.
 type LocalServer struct {
-	Backends map[string]Backend `toml:"backends"`
+	Backends     map[string]Backend    `toml:"backends"`
+	Dictionaries map[string]Dictionary `toml:"dictionaries,omitempty"`
 }
 
 // Backend represents a backend to be mocked by the local testing server.
@@ -225,6 +226,12 @@ type Backend struct {
 	OverrideHost string `toml:"override_host,omitempty"`
 }
 
+// Dictionary represents a dictionary to be mocked by the local testing server.
+type Dictionary struct {
+	File   string `toml:"file"`
+	Format string `toml:"format"`
+}
+
 // Exists yields whether the manifest exists.
 func (f *File) Exists() bool {
 	return f.exists

pkg/commands/compute/testdata/init/fastly-viceroy-update.toml

@@ -20,3 +20,9 @@ name = "Default Rust template"
 
     [local_server.backends.bar]
       url = "https://bar.com/"
+
+  [local_server.dictionaries]
+
+    [local_server.dictionaries.strings]
+      file = "strings.json"
+      format = "json"