Set correct file modes in bb_cliend.deb

Instead of the default 555 (read, exec), use 444 (read) on
non-executables. This fixes the journalctl warning "Configuration file
/usr/lib/systemd/user/bb_clientd.service is marked executable."

Author: moroten

BUILD.bazel

@@ -26,6 +26,11 @@ pkg_tar(
         ":configs/linux/logind.conf": "/etc/systemd/logind.conf.d/bb_clientd.conf",
         ":configs/linux/systemd.service": "/usr/lib/systemd/user/bb_clientd.service",
     },
+    mode = "444",
+    modes = {
+        "/usr/bin/bb_clientd": "555",
+        "/usr/lib/bb_clientd/launch_bb_clientd_linux.sh": "555",
+    },
 )
 
 # When built with --stamp, creates a non-deterministic output file for pushing images to a remote registry.