added CI for unit testing (#69)

.github/workflows/build.yml

@@ -0,0 +1,40 @@
+name: Build
+on:
+  pull_request:
+    types: [review_requested]
+    branches:
+      - "*"
+
+jobs:
+  build:
+    name: Build and test Colossal-AI
+    runs-on: [self-hosted, gpu]
+    container:
+      image: nvcr.io/nvidia/pytorch:21.07-py3
+      options: --gpus all --rm --ipc=host -v /data/cifar-10:/data/cifar-10
+    timeout-minutes: 1200
+    if: github.event.pull_request.draft == false && github.base_ref == 'main' && github.event.pull_request.base.repo.full_name == 'hpcaitech/ColossalAI'
+    steps:
+      - name: Setup Environment
+        run: |
+          export https_proxy=http://172.17.0.1:7890 http_proxy=http://172.17.0.1:7890 all_proxy=socks5://172.17.0.1:7890
+      - name: Install dependencies
+        run: |
+          python3 -m pip config set global.index-url https://pypi.tuna.tsinghua.edu.cn/simple
+          python3 -m pip install -U pip setuptools wheel --user
+          pip install pytest tensorboard deepspeed apex
+      - uses: actions/checkout@v2
+      - name: Install Colossal-AI      
+        run: |
+          pip install -v --no-cache-dir --global-option="--cuda_ext" .
+      - name: Unit Testing
+        run: |
+          pytest tests
+        env:
+          DATA: /data/cifar-10
+          
+
+          
+
+
+