diff --git a/internal/hub/debug.go b/internal/hub/debug.go
new file mode 100644
index 000000000..6f42ab426
--- /dev/null
+++ b/internal/hub/debug.go
@@ -0,0 +1,17 @@
+//go:build debug
+// +build debug
+
+package hub
+
+import (
+	"os"
+
+	"github.com/photoprism/photoprism/pkg/clean"
+)
+
+func init() {
+	if debugUrl := os.Getenv("PHOTOPRISM_HUB_URL"); debugUrl != "" {
+		log.Infof("config: set hub url to %s", clean.Log(debugUrl))
+		ServiceURL = debugUrl
+	}
+}
diff --git a/scripts/build.sh b/scripts/build.sh
index e2aa0150a..66266fb82 100755
--- a/scripts/build.sh
+++ b/scripts/build.sh
@@ -20,9 +20,9 @@ GO_VER=$($GO_BIN version)
 echo "Building PhotoPrism ${BUILD_ID} ($1)…"
 
 if [[ $1 == "debug" ]]; then
-  BUILD_CMD=("$GO_BIN" build -ldflags "-X main.version=${BUILD_ID}-DEBUG" -o "${BUILD_BIN}" cmd/photoprism/photoprism.go)
+  BUILD_CMD=("$GO_BIN" build -tags=debug -ldflags "-X main.version=${BUILD_ID}-DEBUG" -o "${BUILD_BIN}" cmd/photoprism/photoprism.go)
 elif [[ $1 == "race" ]]; then
-  BUILD_CMD=("$GO_BIN" build -race -ldflags "-X main.version=${BUILD_ID}-DEBUG" -o "${BUILD_BIN}" cmd/photoprism/photoprism.go)
+  BUILD_CMD=("$GO_BIN" build -tags=debug -race -ldflags "-X main.version=${BUILD_ID}-DEBUG" -o "${BUILD_BIN}" cmd/photoprism/photoprism.go)
 elif [[ $1 == "static" ]]; then
   BUILD_CMD=("$GO_BIN" build -a -v -ldflags "-linkmode external -extldflags \"-static -L /usr/lib -ltensorflow\" -s -w -X main.version=${BUILD_ID}" -o "${BUILD_BIN}" cmd/photoprism/photoprism.go)
 else