Install bazel as a prereq through apt

Pin to version 5.1.1

gLinux: should work as is
CI: The bazel apt source/repository is setup in docker image build
external: follow the GettingStarted guide to setup the bazel apt
source/repository

Change-Id: Id9cc49024f594ac7830cd1ab6ca35a1b26d917fc

install-prereqs.sh

diff --git a/install-prereqs.sh b/install-prereqs.sh
index 99986d4..7c02527 100755
--- a/install-prereqs.sh
+++ b/install-prereqs.sh
@@ -19,6 +19,8 @@
 
 APT_PACKAGES=(
     asciidoctor
+    bazel
+    bazel-5.1.1
     bison
     build-essential
     ccache