Update CI workflow using the example provided by haskell-actions/setup (#55)

Author: sestrella

.github/workflows/main.yml

@@ -1,33 +1,57 @@
+# The following workflow is based on the example provided by
+# haskell-actions/setup:
+#
+# https://github.com/haskell-actions/setup#model-cabal-workflow-with-caching
+
 name: CI
 
 on: push
 
+concurrency:
+  group: build-${{ github.ref }}
+  cancel-in-progress: true
+
 jobs:
   build:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        ghc: ['8.8', '8.10']
-
+        ghc-version: ['8.10', '8.8']
     steps:
-      - uses: actions/checkout@v4
-      - name: Setup Haskell
-        uses: haskell/actions/setup@v2
+      - name: Checkout code
+        uses: actions/checkout@v4
+      - name: Setup Haskell tools
+        uses: haskell-actions/setup@v2
+        id: setup
         with:
-          ghc-version: ${{ matrix.ghc }}
+          ghc-version: ${{ matrix.ghc-version }}
           cabal-version: 'latest'
-      - uses: actions/cache@v3.3.2
+          cabal-update: true
+      - name: Configure the build
+        run: |
+          cabal configure --enable-tests --disable-documentation
+          cabal build all --dry-run
+      - name: Restore cached dependencies
+        uses: actions/cache/restore@v3
+        id: cache
+        env:
+          key: ${{ runner.os }}-ghc-${{ steps.setup.outputs.ghc-version }}-cabal-${{ steps.setup.outputs.cabal-version }}
+        with:
+          path: ${{ steps.setup.outputs.cabal-store }}
+          key: ${{ env.key }}-plan-${{ hashFiles('**/plan.json') }}
+          restore-keys: ${{ env.key }}-
+      - name: Install dependencies
+        if: steps.cache.outputs.cache-hit != 'true'
+        run: cabal build all --only-dependencies
+      - name: Save cached dependencies
+        uses: actions/cache/save@v3
+        if: steps.cache.outputs.cache-hit != 'true'
         with:
-          path: ~/.cabal
-          key: cabal--${{ matrix.ghc }}-${{ hashFiles('*/*.cabal') }}
-          restore-keys: |
-            cabal--${{ matrix.ghc }}-${{ hashFiles('*/*.cabal') }}
-            cabal--${{ matrix.ghc }}-
-            cabal-
-      - run: cabal update
-      - run: cabal configure --enable-tests
-      - run: cabal build all --only-dependencies
-      - run: cabal build all
-      - run: cabal test all
+          path: ${{ steps.setup.outputs.cabal-store }}
+          key: ${{ steps.cache.outputs.cache-primary-key }}
+      - name: Build
+        run: cabal build all
+      - name: Run tests
+        run: cabal test all
         env:
           ROLLBAR_TOKEN: ${{ secrets.ROLLBAR_TOKEN }}

flake.lock

@@ -1,7 +1,7 @@
 {
   inputs = {
     flake-utils.url = "github:numtide/flake-utils";
-    nixpkgs.url = "nixpkgs/nixos-22.11-small";
+    nixpkgs.url = "github:nixos/nixpkgs/nixos-23.11";
   };
 
   outputs = { self, flake-utils, nixpkgs }: