use isAllPackages to genereta tmp conf

Signed-off-by: Juan Pablo Garcia Ripa <juanpablog@spotify.com>

.changeset/curvy-ducks-explode.md

@@ -0,0 +1,5 @@
+---
+'@backstage/repo-tools': patch
+---
+
+Use the project tsconfig in case of selection all packages

packages/repo-tools/src/commands/api-reports/api-reports.ts

@@ -66,7 +66,7 @@ export const buildApiReports = async (paths: string[] = [], opts: Options) => {
   }
 
   let temporaryTsConfigPath: string | undefined;
-  if (selectedPackageDirs) {
+  if (!isAllPackages) {
     temporaryTsConfigPath = await createTemporaryTsConfig(selectedPackageDirs);
   }
   const tsconfigFilePath =