repo-tools: make generate-patch add global resolution entry as fallback

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>

.changeset/strange-clocks-pretend.md

@@ -0,0 +1,5 @@
+---
+'@backstage/repo-tools': patch
+---
+
+The `generate-patch` command will now fall back to always adding a `resolutions` entry, even if no matching descriptors are found.

packages/repo-tools/src/commands/generate-patch/generate-patch.ts

@@ -217,8 +217,12 @@ async function loadTrimmedRootPkg(ctx: PatchContext, query?: string) {
   }
 
   return async (patchEntry?: string) => {
-    for (const descriptor of descriptors) {
-      resolutionsObj[descriptor] = patchEntry;
+    if (descriptors.length > 0) {
+      for (const descriptor of descriptors) {
+        resolutionsObj[descriptor] = patchEntry;
+      }
+    } else {
+      resolutionsObj[ctx.packageName] = patchEntry;
     }
     // We use the same patch for all versions of the package, if they don't
     // apply it might require manual intervention using the --query option