Add bazel role

Closes: theopenlab/openlab#340

roles/config-bazel/defaults/main.yml

@@ -0,0 +1,2 @@
+---
+bazel_version: '0.28.1'

roles/config-bazel/tasks/main.yml

@@ -0,0 +1,16 @@
+# We can install specify version bazel in task, like this:
+#- roles:
+#  - role: config-bazel
+#      bazel_version: '0.28.1'
+---
+- name: Install bazel
+  shell: |
+    set -ex
+    apt-get update
+    apt-get -y install build-essential openjdk-8-jdk python zip unzip
+    wget https://github.com/theopenlab/package/releases/download/master/bazel.{{ bazel_version }}
+    chmod +x ./bazel.{{ bazel_version }}
+    cp bazel.{{ bazel_version }} /usr/local/bin/bazel
+    bazel version
+  args:
+    executable: /bin/bash