tools/release.sh: Simplify our release build process

Rather than having 3 commands for a human to type in by hand,
lets wrap it all up into a tiny shell script.

Change-Id: I967416266e7cde3a2a5ae567bdc4524c874b4a34
Signed-off-by: Shawn O. Pearce <sop@google.com>
3 files changed