Include default alpha export during package detection

Co-authored-by: Fredrik Adelöw <freben@gmail.com>
Co-authored-by: Patrik Oldsberg <poldsberg@gmail.com>
Co-authored-by: Camila Belo <camilaibs@gmail.com>
Co-authored-by: Philipp Hugenroth <philipph@spotify.com>
Signed-off-by: Johan Haals <johan.haals@gmail.com>

.changeset/wise-boxes-kiss.md

@@ -0,0 +1,5 @@
+---
+'@backstage/cli': patch
+---
+
+Include default alpha export during package detection

packages/cli/src/lib/bundler/packageDetection.ts

@@ -70,6 +70,11 @@ async function detectPackages(
           depPackageJson.backstage?.role ?? '',
         )
       ) {
+        // Include alpha entry point if available. If there's no default export it will be ignored
+        const exp = depPackageJson.exports;
+        if (exp && typeof exp === 'object' && './alpha' in exp) {
+          return [depName, `${depName}/alpha`];
+        }
         return [depName];
       }
       return [];