Create build.yaml

.github/workflows/build.yaml

@@ -0,0 +1,30 @@
+name: Build
+env:
+  CACHE_NAME: marlowe-temp
+  TRUSTED_PUBLIC_KEYS: "cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY= purescript-unlift.cachix.org-1:1gPjVFpu4QjaAT3tRurCioX+BC23V7mjvFwpP5bV0Ec="
+  SUBSTITUTERS: "https://cache.nixos.org/ https://purescript-unlift.cachix.org"
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+  workflow_dispatch:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2.3.4
+      - uses: cachix/install-nix-action@v16
+        with:
+          nix_path: nixpkgs=channel:nixos-unstable
+          install_url: https://releases.nixos.org/nix/nix-2.5.1/install
+          extra_nix_config: |
+            trusted-public-keys = ${{ env.TRUSTED_PUBLIC_KEYS }}
+            substituters = ${{ env.SUBSTITUTERS }}
+            experimental-features = nix-command flakes
+      - uses: cachix/cachix-action@v10
+        with:
+          name: ${{ env.CACHE_NAME }}
+          authToken: "${{ secrets.CACHIX_AUTH_TOKEN }}"
+      - run: nix build