Append to tee log

PKGBUILD

@@ -11,7 +11,7 @@ pkgname=linux-${postfix}
 # The firmware the kernel produces blows: don't falsify this lightly
 # "linux-firmware=20170309.695f2d6-1"
 pkgrel=1
-pkgver=5.7.rc6.89.g254d929d7df7
+pkgver=5.7.rc6.104.gb036718c2ac7
 pkgdesc="Kernel build from head"
 arch=("x86_64" "aarch64" "armv7h")
 license=("GPL2.1")
@@ -33,10 +33,10 @@ build() {
   cd $_kernel_src_dir && git clean -xdf
   cp ${_config_file} ${_kernel_src_dir}/.config
   ${_make_cmd} | tee ${log_path}
-  ${_make_cmd} modules | tee ${log_path}
+  ${_make_cmd} modules | tee -a ${log_path}
 
   if [ -n "${LOCAL_PI_VER}" ]; then
-    ${_make_cmd} dtbs | tee ${log_path}
+    ${_make_cmd} dtbs | tee -a ${log_path}
   fi
 }