...

.github/workflows/cabal.yml

@@ -29,15 +29,37 @@ jobs:
         cabal-version: ${{ matrix.cabal }}
         cabal-update: true
 
-    - uses: actions/cache@v4
-      name: cache ~/.cabal/store
+    - name: Install Dhall
+      run: cabal install dhall-1.42.1
+
+    - name: Configure the build
+      run: |
+        cabal configure --enable-tests --enable-benchmarks --disable-documentation
+        cabal build all --dry-run
+
+    - name: Restore cached dependencies
+      uses: actions/cache/restore@v4
+      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@v4
+      if: steps.cache.outputs.cache-hit != 'true'
       with:
-        path: ~/.cabal/store
-        key: ${{ runner.os }}-cabal-${{ matrix.cabal }}-ghc-${{ matrix.vers.ghc }}
+        path: ${{ steps.setup.outputs.cabal-store }}
+        key: ${{ steps.cache.outputs.cache-primary-key }}
 
     - name: build
       run: |
-        cabal install dhall-1.42.1
         GHC_VERSION=${{ matrix.vers.ghc }} STACKAGE_VERSION=${{ matrix.vers.stackage }} make -f project-files.mk
         cabal build all --enable-tests