Move from TravisCI to GitHub actions

.github/workflows/test.yml

@@ -0,0 +1,37 @@
+name: build and test
+on:
+  push:
+    branches:
+      - *
+  schedule:
+    - cron: '0 3 * * *'
+  pull_request:
+    branches:
+      - *
+jobs:
+  nix:
+    runs-on: [ubuntu-latest, macos-latest]
+    steps:
+      - uses: actions/checkout@v2.3.4
+      - uses: cachix/install-nix-action@v13
+      - run: nix-build --arg src ./.
+  pip:
+    runs-on: ubuntu-latest
+    strategy: fail-fast
+    matrix:
+      python-version: [3.6, 3.7, 3.8, 3.9]
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v2
+        with:
+          python-version: ${{ matrix.python-version }}
+      - name: Install
+        run: |
+          sudo ./install_dependencies.sh
+          pip install --upgrade pip
+          pip3 install -e .
+      - name: Test
+        run: ./test.sh
+      - name: Test 2  
+        run:  TEMCI_TEST_CMD=1 ./test.sh