ci: cabal cache

.github/workflows/haskell.yaml

@@ -9,16 +9,45 @@ on:
 permissions:
   contents: read
 
+steps: &cabal-test
+- uses: actions/checkout@v4
+
+- name: Cache Cabal
+  id: cache-cabal
+  uses: actions/cache@v4
+  with:
+    path: ~/.cabal
+    key: ${{ runner.os }}-build-${{ env.cache-name }}-${{ hashFiles('**/*.cabal') }}-${{ hashFiles('**/cabal.project') }}
+    restore-keys: |
+      ${{ runner.os }}-build-${{ env.cache-name }}-
+      ${{ runner.os }}-build-
+      ${{ runner.os }}-
+
+- name: Install dependencies
+  run: |
+    cabal update
+    cabal build --only-dependencies --enable-tests --enable-benchmarks
+- name: Build
+  run: cabal build --enable-tests --enable-benchmarks all
+- name: Test
+  run: cabal test
+
+
+
 jobs:
-  build:
 
+  build-982:
     runs-on: ubuntu-latest
-
     container:
       image: haskell:9.8.2
+    steps: *cabal-test
+
+  build-966:
+    runs-on: ubuntu-latest
+    container:
+      image: haskell:9.6.6
+    steps: *cabal-test
 
-    steps:
-    - uses: actions/checkout@v4
 
     # - uses: actions/setup-haskell@v1
     #   with:
@@ -36,13 +65,3 @@ jobs:
     #       ${{ runner.os }}-build-${{ env.cache-name }}-
     #       ${{ runner.os }}-build-
     #       ${{ runner.os }}-
-
-    - name: Install dependencies
-      run: |
-        cabal update
-        cabal build --only-dependencies --enable-tests --enable-benchmarks
-    - name: Build
-      run: cabal build --enable-tests --enable-benchmarks all
-    - name: Test
-      run: cabal test
-