fix(cli-module-build): ignore MF version warning for secondary entry points

Signed-off-by: David Festal <dfestal@redhat.com>

.changeset/plenty-weeks-stop.md

@@ -0,0 +1,5 @@
+---
+'@backstage/cli-module-build': patch
+---
+
+Suppressed false-positive Module Federation warning for shared dependencies that use secondary entry points (e.g. `@mui/material/styles`). These sub-path `package.json` files lack a `version` field, causing the bundler to emit "No version specified" warnings that fail CI builds.

packages/cli-module-build/src/lib/bundler/config.ts

@@ -394,5 +394,16 @@ export async function createConfig(
       }),
     },
     plugins,
+    ...(options.moduleFederationRemote && {
+      // TODO: remove this warning skipping as soon as the corresponding bundler limitation
+      // described in issue https://github.com/web-infra-dev/rspack/issues/13635 is fixed
+      // when PR: https://github.com/web-infra-dev/rspack/pull/13636 is merged.
+      ignoreWarnings: [
+        {
+          message:
+            /No version specified and unable to automatically determine one\. No version in description file/,
+        },
+      ],
+    }),
   };
 }