automation: dump contents of /etc/os-release

To aid debugging build failures, dump /etc/os-release during build.
This helps with rolling releases such as Tumbleweed to understand the
state of the build container.

Signed-off-by: Olaf Hering <olaf@aepfle.de>
Acked-by: Andrew Cooper <andrew.cooper3@citrix.com>

automation/scripts/build

@@ -1,5 +1,7 @@
 #!/bin/bash -ex
 
+test -f /etc/os-release && cat "$_"
+
 $CC --version
 
 # Express the compiler version as an integer.  e.g. GCC 4.9.2 => 0x040902