ci(mge): merge try-import automatically

.github/workflows/ci-cpu.yml

-name: CI CPU
-
-on:
-  push:
-    branches: [master, try-import]
-  pull_request:
-
-jobs:
-  cpu-test:
-    runs-on: self-hosted
-    container:
-      image: localhost:5000/megengine-ci:latest
-    steps:
-      - name: Checkout MegEngine
-        uses: actions/checkout@v2
-      - name: Checkout submodules
-        run: |
-          ./third_party/prepare.sh
-          ./third_party/install-mkl.sh
-      - name: Build MegEngine
-        run: ./ci/cmake.sh cpu
-      - name: Python test
-        run: ./ci/run_python_test.sh cpu
-      - name: C++ test
-        run: ./ci/run_cpp_test.sh cpu

.github/workflows/ci-cuda.yml → .github/workflows/ci.yml

-name: CI GPU
+name: CI
 
 on:
   push:
     branches: [master, try-import]
   pull_request:
-
+  
 jobs:
+  cpu-test:
+    runs-on: self-hosted
+    container:
+      image: localhost:5000/megengine-ci:latest
+    steps:
+      - name: Checkout MegEngine
+        uses: actions/checkout@v2
+      - name: Checkout submodules
+        run: |
+          ./third_party/prepare.sh
+          ./third_party/install-mkl.sh
+      - name: Build MegEngine
+        run: ./ci/cmake.sh cpu
+      - name: Python test
+        run: ./ci/run_python_test.sh cpu
+      - name: C++ test
+        run: ./ci/run_cpp_test.sh cpu
   gpu-test:
     runs-on: self-hosted
     container:
@@ -15,7 +32,6 @@ jobs:
       options: --gpus all --shm-size 1g
       env:
         NCCL_LAUNCH_MODE: PARALLEL
-
     steps:
       - name: Checkout MegEngine
         uses: actions/checkout@v2
@@ -29,3 +45,20 @@ jobs:
         run: ./ci/run_python_test.sh cuda
       - name: C++ test
         run: ./ci/run_cpp_test.sh cuda
+  auto-merge:
+    if: ${{ github.ref == 'refs/heads/try-import' }}
+    runs-on: ubuntu-latest
+    needs: [cpu-test, gpu-test]
+    steps:
+      - name: Checkout MegEngine
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: '0'
+      - name: Merge with master
+        run: |
+          git config user.name "megvii-mge"
+          git config user.email "megengine@megvii.com"
+          git fetch origin master
+          git checkout -b master origin/master
+          git rebase try-import
+          git push