Stream the download and extraction of zstd bundles

Behind a feature flag

src/feature-flags.ts

@@ -54,6 +54,7 @@ export enum Feature {
   ExportDiagnosticsEnabled = "export_diagnostics_enabled",
   QaTelemetryEnabled = "qa_telemetry_enabled",
   ZstdBundle = "zstd_bundle",
+  ZstdBundleStreamingExtraction = "zstd_bundle_streaming_extraction",
 }
 
 export const featureConfig: Record<
@@ -139,6 +140,11 @@ export const featureConfig: Record<
     // version check separately.
     minimumVersion: undefined,
   },
+  [Feature.ZstdBundleStreamingExtraction]: {
+    defaultValue: false,
+    envVar: "CODEQL_ACTION_ZSTD_BUNDLE_STREAMING_EXTRACTION",
+    minimumVersion: undefined,
+  },
 };
 
 /**