added flake + CI tests

.github/workflows/tests_native.yml

@@ -0,0 +1,46 @@
+on: 
+  pull_request:
+  workflow_dispatch:
+
+# this cancels workflows currently in progress if you start a new one
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+
+  run-tests:
+    runs-on: [ubuntu-22.04]
+    steps:
+      - uses: actions/checkout@v3
+
+      # get roc cli 
+      - id: try_fetching_testing_release
+        continue-on-error: true
+        run: |
+          curl -fOL https://github.com/roc-lang/roc/releases/download/nightly/roc_nightly-linux_x86_64-TESTING.tar.gz
+
+      - name: There are no TESTING releases, checking regular releases instead
+        if: steps.try_fetching_testing_release.outcome == 'failure'
+        run: |
+          curl -fOL https://github.com/roc-lang/roc/releases/download/nightly/roc_nightly-linux_x86_64-latest.tar.gz
+
+      - name: rename nightly tar
+        run: mv $(ls | grep "roc_nightly.*tar\.gz") roc_nightly.tar.gz
+
+      - name: decompress the tar
+        run: tar -xzf roc_nightly.tar.gz
+
+      - run: rm roc_nightly.tar.gz
+
+      - name: simplify nightly folder name
+        run: mv roc_nightly* roc_nightly
+
+      - name: Add roc_nightly to PATH
+        run: echo "${{ github.workspace }}/roc_nightly" >> $GITHUB_PATH
+
+      - run: roc version
+
+      # run all tests 
+      - name: Run tests
+        run: ./CI/all_tests.sh

.github/workflows/tests_nix.yml

@@ -0,0 +1,26 @@
+on:
+  pull_request:
+  workflow_dispatch:
+
+# this cancels workflows currently in progress if you start a new one
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  run-tests-nix:
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-22.04]
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v3
+
+      # install nix
+      - uses: cachix/install-nix-action@v23
+        with:
+          nix_path: nixpkgs=channel:nixos-unstable
+
+      - name: Run tests
+        run: nix develop -c sh -c './CI/all_tests.sh'

CI/all_tests.sh

@@ -0,0 +1,6 @@
+#!/usr/bin/env bash
+
+# https://vaneyckt.io/posts/safer_bash_scripts_with_set_euxo_pipefail/
+set -exo pipefail
+
+roc check main.roc

flake.nix

@@ -0,0 +1,39 @@
+{
+  description = "roc agent devShell flake";
+
+  inputs = {
+    roc.url = "github:roc-lang/roc";
+    nixpkgs.follows = "roc/nixpkgs";
+
+    # to easily make configs for multiple architectures
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = { self, nixpkgs, flake-utils, roc }:
+    let supportedSystems = [ "x86_64-linux" "x86_64-darwin" "aarch64-darwin" "aarch64-linux" ];
+    in flake-utils.lib.eachSystem supportedSystems (system:
+      let
+        pkgs = import nixpkgs { inherit system; };
+        rocPkgs = roc.packages.${system};
+
+        linuxInputs = with pkgs;
+          lib.optionals stdenv.isLinux [
+          ];
+
+        darwinInputs = with pkgs;
+          lib.optionals stdenv.isDarwin
+          (with pkgs.darwin.apple_sdk.frameworks; [
+          ]);
+
+        sharedInputs = (with pkgs; [
+          rocPkgs.cli
+        ]);
+      in {
+
+        devShell = pkgs.mkShell {
+          buildInputs = sharedInputs ++ darwinInputs ++ linuxInputs;
+        };
+
+        formatter = pkgs.nixpkgs-fmt;
+      });
+}