test workflow to build (#1)

* test workflow to build (sans cachix)
Signed-off-by: Vanessasaurus <814322+vsoch@users.noreply.github.com>

.github/workflows/build.yaml

@@ -0,0 +1,55 @@
+name: "Build and populate cache"
+on:
+  pull_request:
+  push:
+    branches:
+      - main
+  schedule:
+    # rebuild everyday at 3:45
+    - cron:  '45 3 * * *'
+jobs:
+  tests:
+    strategy:
+      matrix:
+        # Set this to notify the global nur package registry that changes are
+        # available.
+        #
+        # The repo name as used in
+        # https://github.com/nix-community/NUR/blob/master/repos.json
+        nurRepo:
+          - rseops
+        nixPath:
+          - nixpkgs=channel:nixos-unstable
+          - nixpkgs=channel:nixpkgs-unstable
+          - nixpkgs=channel:nixos-22.05
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v3
+    - name: Install nix
+      uses: cachix/install-nix-action@v18
+      with:
+        nix_path: "${{ matrix.nixPath }}"
+        # nix 2.6 breaks restrict-eval, when using the NIX_PATH
+        # see https://github.com/NixOS/nix/issues/5980
+        install_url: https://releases.nixos.org/nix/nix-2.5.1/install
+        extra_nix_config: |
+          experimental-features = nix-command flakes
+          access-tokens = github.com=${{ secrets.GITHUB_TOKEN }}
+    - name: Show nixpkgs version
+      run: nix-instantiate --eval -E '(import <nixpkgs> {}).lib.version'
+    - name: Check evaluation
+      run: |
+        nix-env -f . -qa \* --meta --xml \
+          --allowed-uris https://static.rust-lang.org \
+          --option restrict-eval true \
+          --option allow-import-from-derivation true \
+          --drv-path --show-trace \
+          -I nixpkgs=$(nix-instantiate --find-file nixpkgs) \
+          -I $PWD
+    - name: Build nix packages
+      run: nix shell -f '<nixpkgs>' nix-build-uncached -c nix-build-uncached ci.nix -A cacheOutputs
+    - name: Trigger NUR update
+      # Don't replace <YOUR_REPO_NAME> here!
+      if: ${{ matrix.nurRepo != '<YOUR_REPO_NAME>' }}
+      run: curl -XPOST "https://nur-update.herokuapp.com/update?repo=${{ matrix.nurRepo }}"