Evict remote objects from every cache layer

DELETE /objects only removed the artifacts row, so mutable indexes (S3
index object + Redis TTL/ETag keys) kept being served. Clear all layers
and treat a trailing * as a prefix.

internal/api/v2/objects_evict_test.go

@@ -0,0 +1,32 @@
+package v2
+
+import (
+	"context"
+	"net/http/httptest"
+	"testing"
+
+	"github.com/go-chi/chi/v5"
+)
+
+type fakeEvictor struct{ remote, path string }
+
+func (f *fakeEvictor) Evict(_ context.Context, remote, path string) error {
+	f.remote, f.path = remote, path
+	return nil
+}
+
+func TestRemoteEvictDelegatesToEvictor(t *testing.T) {
+	for _, path := range []string{"8/Everything/x86_64/repodata/repomd.xml", "8/Everything/x86_64/repodata/*"} {
+		ev := &fakeEvictor{}
+		h := NewObjectsHandler(nil, ev)
+		router := chi.NewRouter()
+		router.Route("/remotes/{name}/objects", func(r chi.Router) {
+			r.Delete("/*", h.Routes().ServeHTTP)
+		})
+		w := httptest.NewRecorder()
+		router.ServeHTTP(w, httptest.NewRequest("DELETE", "/remotes/epel/objects/"+path, nil))
+		if w.Code != 204 || ev.remote != "epel" || ev.path != path {
+			t.Errorf("DELETE %s: code=%d evicted=%q/%q", path, w.Code, ev.remote, ev.path)
+		}
+	}
+}