feat: Adds 'all' datastore config option (#579)

Adds a new `datastore: all` configuration option to `domain.yaml`.

When `datastore: all` is set:
- **Reads**: During env loading Initial data is read from remote catalog
- **Writes**: Merge operations write to both local and remote catalog

## Configuration Example
```yaml
environments:
  example:
    network_types:
      - testnet
    protected: false
    datastore: all
```

Author: giogam

.changeset/ten-readers-dance.md

@@ -0,0 +1,5 @@
+---
+"chainlink-deployments-framework": minor
+---
+
+feat: adds 'all' datastore config option

engine/cld/config/domain/domain.go

@@ -17,6 +17,9 @@ const (
 	DatastoreTypeFile DatastoreType = "file"
 	// DatastoreTypeCatalog indicates data should be persisted to the remote catalog service.
 	DatastoreTypeCatalog DatastoreType = "catalog"
+	// DatastoreTypeAll indicates data should be persisted to both local JSON files and the remote catalog service.
+	// This is useful to keep backward compatibility during the transition period from file-based to remote catalog.
+	DatastoreTypeAll DatastoreType = "all"
 )
 
 // String returns the string representation of the DatastoreType.
@@ -26,7 +29,7 @@ func (d DatastoreType) String() string {
 
 // IsValid checks if the DatastoreType is a valid value.
 func (d DatastoreType) IsValid() bool {
-	return d == DatastoreTypeFile || d == DatastoreTypeCatalog
+	return d == DatastoreTypeFile || d == DatastoreTypeCatalog || d == DatastoreTypeAll
 }
 
 // Environment represents a single environment configuration.
@@ -59,7 +62,7 @@ func (e *Environment) validate() error {
 
 	// Validate datastore field if provided
 	if e.Datastore != "" && !e.Datastore.IsValid() {
-		return fmt.Errorf("invalid datastore value: %s (must be 'file' or 'catalog')", e.Datastore)
+		return fmt.Errorf("invalid datastore value: %s (must be 'file', 'catalog', or 'all')", e.Datastore)
 	}
 
 	return nil

engine/cld/config/domain/domain_test.go

@@ -66,6 +66,11 @@ func TestDatastoreType_IsValid(t *testing.T) {
 			datastore: DatastoreTypeCatalog,
 			expected:  true,
 		},
+		{
+			name:      "all is valid",
+			datastore: DatastoreTypeAll,
+			expected:  true,
+		},
 		{
 			name:      "invalid value",
 			datastore: DatastoreType("invalid"),
@@ -133,6 +138,14 @@ func TestEnvironment_Validate(t *testing.T) {
 			},
 			wantErr: false,
 		},
+		{
+			name: "valid environment with all datastore",
+			environment: Environment{
+				NetworkTypes: []string{"testnet"},
+				Datastore:    DatastoreTypeAll,
+			},
+			wantErr: false,
+		},
 		{
 			name: "valid environment without datastore (optional field)",
 			environment: Environment{

engine/cld/legacy/cli/commands/migration.go

@@ -497,17 +497,17 @@ func (Commands) newMigrationDataStoreMerge(domain domain.Domain) *cobra.Command
 			}
 
 			// Determine which merge method to use based on datastore configuration
-			if cfg.DatastoreType == cfgdomain.DatastoreTypeCatalog {
-				ctx := cmd.Context()
+			switch cfg.DatastoreType {
+			case cfgdomain.DatastoreTypeCatalog:
 				// Catalog mode - merge to catalog service
 				cmd.Printf("📡 Using catalog datastore mode (endpoint: %s)\n", cfg.Env.Catalog.GRPC)
 
-				catalog, catalogErr := cldcatalog.LoadCatalog(ctx, envKey, cfg, domain)
+				catalog, catalogErr := cldcatalog.LoadCatalog(cmd.Context(), envKey, cfg, domain)
 				if catalogErr != nil {
 					return fmt.Errorf("failed to load catalog: %w", catalogErr)
 				}
 
-				if err := envDir.MergeMigrationDataStoreCatalog(ctx, migrationName, timestamp, catalog); err != nil {
+				if err := envDir.MergeMigrationDataStoreCatalog(cmd.Context(), migrationName, timestamp, catalog); err != nil {
 					return fmt.Errorf("error during data store merge to catalog for %s %s %s: %w",
 						domain, envKey, migrationName, err,
 					)
@@ -516,7 +516,7 @@ func (Commands) newMigrationDataStoreMerge(domain domain.Domain) *cobra.Command
 				cmd.Printf("✅ Merged data stores to catalog for %s %s %s\n",
 					domain, envKey, migrationName,
 				)
-			} else {
+			case cfgdomain.DatastoreTypeFile:
 				// File mode - merge to local files
 				cmd.Printf("📁 Using file-based datastore mode\n")
 
@@ -529,6 +529,32 @@ func (Commands) newMigrationDataStoreMerge(domain domain.Domain) *cobra.Command
 				cmd.Printf("✅ Merged data stores to local files for %s %s %s\n",
 					domain, envKey, migrationName,
 				)
+			case cfgdomain.DatastoreTypeAll:
+				// All mode - merge to both catalog and local files
+				cmd.Printf("📡 Using all datastore mode (catalog: %s, file: %s)\n", cfg.Env.Catalog.GRPC, envDir.DataStoreDirPath())
+
+				catalog, catalogErr := cldcatalog.LoadCatalog(cmd.Context(), envKey, cfg, domain)
+				if catalogErr != nil {
+					return fmt.Errorf("failed to load catalog: %w", catalogErr)
+				}
+
+				if err := envDir.MergeMigrationDataStoreCatalog(cmd.Context(), migrationName, timestamp, catalog); err != nil {
+					return fmt.Errorf("error during data store merge to catalog for %s %s %s: %w",
+						domain, envKey, migrationName, err,
+					)
+				}
+
+				if err := envDir.MergeMigrationDataStore(migrationName, timestamp); err != nil {
+					return fmt.Errorf("error during data store merge to file for %s %s %s: %w",
+						domain, envKey, migrationName, err,
+					)
+				}
+
+				cmd.Printf("✅ Merged data stores to both catalog and local files for %s %s %s\n",
+					domain, envKey, migrationName,
+				)
+			default:
+				return fmt.Errorf("invalid datastore type: %s", cfg.DatastoreType)
 			}
 
 			return nil