Enable GitHub actions

Author: datakurre

.github/workflows/smoketest.yml

@@ -0,0 +1,19 @@
+name: "smoketest"
+on:
+  push:
+  pull_request:
+jobs:
+  smoketest:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        robotframework-version: [rf31, rf32, rf40]
+    steps:
+    - uses: actions/checkout@v2.3.4
+    - uses: cachix/install-nix-action@v12
+      with:
+        nix_path: nixpkgs=channel:nixos-unstable
+    - uses: cachix/cachix-action@v8
+      with:
+        name: robots-from-jupyter
+    - run: nix-shell setup.nix -A shell --argstr robotframework ${{ matrix.robotframework-version }} --run "make test && python -m robotkernel.install && jupyter nbconvert --execute tests/Smoketest.ipynb && nbrobot -v BROWSER:headlessfirefox -F ipynb tests atest"