Fix GHA cache collision between remote and local release builds

Both matrix targets were sharing the same cache scope, causing
overwrites and cache misses. Scope caches per target.

.github/workflows/release.yml

@@ -55,5 +55,5 @@ jobs:
           build-args: APP_VERSION=${{ steps.version.outputs.value }}
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}
-          cache-from: type=gha
-          cache-to: type=gha,mode=max
+          cache-from: type=gha,scope=${{ matrix.target }}
+          cache-to: type=gha,mode=max,scope=${{ matrix.target }}