Add github workflow.

.github/workflows/main.yml

@@ -0,0 +1,58 @@
+name: CI
+
+on:
+  push:
+    branches: ['master', 'auto']
+  pull_request:
+
+jobs:
+  Test:
+    runs-on: ubuntu-latest
+    env:
+      HARFBUZZ_SYS_NO_PKG_CONFIG: true
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions-rs/toolchain@v1
+        with:
+          toolchain: stable
+          override: true
+          profile: minimal
+
+      - name: Install packages
+        run: sudo apt-get install -y libegl1-mesa-dev libgtk-3-dev libsdl2-dev cmake
+        
+      - name: Install rustc target
+        run: rustup target add aarch64-unknown-linux-gnu
+        
+      - uses: actions-rs/cargo@v1
+        working-directory: simd
+        with:
+          command: build
+          args: --target aarch64-unknown-linux-gnu
+
+      - uses: actions-rs/cargo@v1
+        working-directory: geometry
+        with:
+          command: build
+          args: --target aarch64-unknown-linux-gnu
+
+      - uses: actions-rs/cargo@v1
+        with:
+          command: build
+
+      - uses: actions-rs/cargo@v1
+        with:
+          command: test
+
+  build_result:
+    name: homu build finished
+    runs-on: ubuntu-latest
+    needs:
+      - "Test"
+    steps:
+      - name: Mark the job as successful
+        run: exit 0
+        if: success()
+      - name: Mark the job as unsuccessful
+        run: exit 1
+        if: "!success()"