Add the --threads config option to finalize db (#281)

This flag is already being used for `runQueries`, so let's use it for
finalize as well.

src/analyze.ts

@@ -122,6 +122,7 @@ async function createdDBForScannedLanguages(
 
 async function finalizeDatabaseCreation(
   config: configUtils.Config,
+  threadsFlag: string,
   logger: Logger
 ) {
   await createdDBForScannedLanguages(config, logger);
@@ -130,7 +131,8 @@ async function finalizeDatabaseCreation(
   for (const language of config.languages) {
     logger.startGroup(`Finalizing ${language}`);
     await codeql.finalizeDatabase(
-      util.getCodeQLDatabasePath(config.tempDir, language)
+      util.getCodeQLDatabasePath(config.tempDir, language),
+      threadsFlag
     );
     logger.endGroup();
   }
@@ -239,7 +241,7 @@ export async function runAnalyze(
   fs.mkdirSync(outputDir, { recursive: true });
 
   logger.info("Finalizing database creation");
-  await finalizeDatabaseCreation(config, logger);
+  await finalizeDatabaseCreation(config, threadsFlag, logger);
 
   logger.info("Analyzing database");
   const queriesStats = await runQueries(

src/codeql.ts

@@ -74,7 +74,7 @@ export interface CodeQL {
   /**
    * Finalize a database using 'codeql database finalize'.
    */
-  finalizeDatabase(databasePath: string): Promise<void>;
+  finalizeDatabase(databasePath: string, threadsFlag: string): Promise<void>;
   /**
    * Run 'codeql resolve queries'.
    */
@@ -561,12 +561,13 @@ function getCodeQLForCmd(cmd: string): CodeQL {
         errorMatchers
       );
     },
-    async finalizeDatabase(databasePath: string) {
+    async finalizeDatabase(databasePath: string, threadsFlag: string) {
       await toolrunnerErrorCatcher(
         cmd,
         [
           "database",
           "finalize",
+          threadsFlag,
           ...getExtraOptionsFromEnv(["database", "finalize"]),
           databasePath,
         ],