Corrected documentation deployment

.github/workflows/haskell.yml

@@ -10,6 +10,9 @@ on:
   workflow_dispatch:
     # inputs:
 
+env:
+  GHC_VERSION: '9.6.3'
+
 jobs:
   build:
     name: GHC ${{ matrix.ghc-version }} on ${{ matrix.os }}
@@ -22,7 +25,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, windows-latest, macos-latest]
-        ghc-version: ['9.6.3']
+        ghc-version: ['$env.GHC_VERSION']
 
     steps:
       - uses: actions/checkout@v3
@@ -84,6 +87,29 @@ jobs:
 
     steps:
       - uses: actions/checkout@v3
+
+      - name: Set up GHC ${{ env.GHC_VERSION }}
+        uses: haskell-actions/setup@v2
+        id: setup
+        with:
+          ghc-version: ${{ env.GHC_VERSION }}
+          cabal-version: 'latest'
+          cabal-update: true
+
+      - name: Configure the build
+        run: |
+          cabal configure --enable-tests --enable-benchmarks --disable-documentation
+          cabal build --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: Build documentation
         run: |