installer: set permission of bazelrc to 0644

So that bazel can read it.

Fixes #894.

--
MOS_MIGRATED_REVID=114689351
diff --git a/scripts/packages/template_bin.sh b/scripts/packages/template_bin.sh
index 3a2901a..e852fd5 100755
--- a/scripts/packages/template_bin.sh
+++ b/scripts/packages/template_bin.sh
@@ -166,6 +166,9 @@
 
 # Not necessary, but this way it matches the Debian package.
 touch "${bazelrc}"
+if [ "${UID}" == 0 ]; then
+  chmod 0644 "${bazelrc}"
+fi
 echo .
 
 cat <<EOF