Adding build files for the buildkite

.buildkite/docker/Dockerfile

@@ -0,0 +1,3 @@
+FROM rust:latest
+
+WORKDIR /sdk-core

.buildkite/docker/build.sh

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+#!/usr/bin/env sh
+set -e
+set -x
+
+cargo build

.buildkite/docker/docker-compose.yaml

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+version: '3.5'
+
+services:
+  unit-test:
+    build:
+      context: ../../
+      dockerfile: .buildkite/docker/Dockerfile
+    command: /bin/sh -c ".buildkite/docker/build.sh"
+    environment:
+      - "USER=unittest"
+    volumes:
+      - "../../:/sdk-core"

.buildkite/pipeline.yml

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+steps:
+  - label: ":rust: Unit test"
+    agents:
+      queue: "default"
+      docker: "*"
+    command: "cargo test"
+    timeout_in_minutes: 15
+    plugins:
+      - docker-compose#v3.0.0:
+          run: unit-test
+          config: .buildkite/docker/docker-compose.yaml
+  - wait