Add feature flag for using zstd bundle

lib/feature-flags.js

@@ -51,6 +51,7 @@ var Feature;
     Feature["DisableKotlinAnalysisEnabled"] = "disable_kotlin_analysis_enabled";
     Feature["ExportDiagnosticsEnabled"] = "export_diagnostics_enabled";
     Feature["QaTelemetryEnabled"] = "qa_telemetry_enabled";
+    Feature["ZstdBundle"] = "zstd_bundle";
 })(Feature || (exports.Feature = Feature = {}));
 exports.featureConfig = {
     [Feature.CleanupTrapCaches]: {
@@ -93,6 +94,13 @@ exports.featureConfig = {
         legacyApi: true,
         minimumVersion: undefined,
     },
+    [Feature.ZstdBundle]: {
+        defaultValue: false,
+        envVar: "CODEQL_ACTION_ZSTD_BUNDLE",
+        // We haven't yet installed CodeQL when we check this feature flag, so we need to implement the
+        // version check separately.
+        minimumVersion: undefined,
+    },
 };
 exports.FEATURE_FLAGS_FILE_NAME = "cached-feature-flags.json";
 /**