Update CI to use new devenv flake

.envrc

@@ -1 +1,10 @@
-use flake
+if ! has nix_direnv_version || ! nix_direnv_version 2.2.1; then
+  source_url "https://raw.githubusercontent.com/nix-community/nix-direnv/2.2.1/direnvrc" "sha256-zelF0vLbEl5uaqrfIzbgNzJWGmLzCmYAkInj/LNxvKs="
+fi
+
+watch_file flake.nix
+watch_file flake.lock
+if ! use flake . --no-pure-eval
+then
+  echo "devenv could not be built. The devenv environment was not loaded. Make the necessary changes to devenv.nix and hit enter to try again." >&2
+fi

.github/workflows/build.yml

@@ -18,24 +18,42 @@ jobs:
     strategy:
       matrix:
         os:
-          - macos-13      # x86_64-darwin
-          - macos-latest  # aarch64-darwin
-          - ubuntu-latest # x86_64-linux
+          # - macos-13      # x86_64-darwin
+          # - macos-latest  # aarch64-darwin
+          - ubuntu-24.04 # x86_64-linux
       fail-fast: true
     runs-on: ${{ matrix.os }}
     timeout-minutes: 30
     steps:
-      - uses: actions/checkout@v4
-      - uses: DeterminateSystems/nix-installer-action@v12
+      - name: Checkout code
+        uses: actions/checkout@v4
+      - name: Install Nix
+        uses: DeterminateSystems/nix-installer-action@v16
         with:
           extra-conf: accept-flake-config = true
-      - uses: DeterminateSystems/magic-nix-cache-action@v7
+      - name: Setup devenv binary cache
+        uses: cachix/cachix-action@v15
+        with:
+          name: devenv
+      - name: Install devenv
+        run:  nix-env -if https://github.com/cachix/devenv/archive/refs/tags/v1.3.1.tar.gz
+      - name: Cache ~/.cabal/packages, ~/.cabal/store and dist-newstyle
+        uses: actions/cache@v4
+        with:
+          path: |
+            ~/.cabal/packages
+            ~/.cabal/store
+            dist-newstyle
+          key: ${{ runner.os }}-${{ matrix.ghc }}-${{ hashFiles('**/*.cabal') }}
+          restore-keys: ${{ runner.os }}-${{ matrix.ghc }}-
+      - name: Update Cabal list of known packages.
+        run: nix develop --no-pure-eval -c cabal update
       - name: Compile code ${{ matrix.ghc }}
-        run: nix build .#test
+        run: nix develop --no-pure-eval -c cabal build
       - name: Run tests ${{ matrix.ghc }}
-        run: nix run .#test
+        run: nix develop --no-pure-eval -c cabal test
 
-  docker:
-    uses: ./.github/workflows/reusable-docker.yml
-    with:
-      push: false
+  # docker:
+  #   uses: ./.github/workflows/reusable-docker.yml
+  #   with:
+  #     push: false

.pre-commit-config.yaml

@@ -0,0 +1,10 @@
+repos:
+    -   repo: local
+        hooks:
+        -   id: hlint
+            name: hlint
+            description: HLint gives suggestions on how to improve your source code.
+            entry: hlint
+            language: system
+            files: '\.l?hs$'
+