Initial commit

.github/workflows/test.yml

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+name: "Test nix-action"
+on:
+  pull_request:
+  push:
+jobs:
+  tests:
+    strategy:
+      matrix:
+        os: [ubuntu-18.04, macos]
+    runs-on: ${{ matrix.os }}
+    steps:
+    - uses: actions/checkout@v1
+    - run: yarn install --frozen-lockfile
+    - run: yarn build
+    - run: yarn test
+    - name: Install Nix
+      uses: ./
+    - run: nix-build test.nix