Add cache

Author: lunaticare

.github/workflows/pre-commit.yml

@@ -19,8 +19,24 @@ jobs:
 
     - name: "Install stylish-haskell"
       run: |
-        cabal update
         cabal install stylish-haskell
 
+    - name: "Check stylish-haskell is available"
+      run: |
+        echo $(which stylish-haskell)
+
+    - name: Compiled deps cache
+      id: stylish-haskell-compiled-cache
+      uses: actions/cache@v2
+      env:
+        cache-name: stylish-haskell-compiled-cache
+      with:
+        path: ${{ env.CABAL_PKGS_DIR }}
+        key:  ${{ inputs.cache-prefix }}${{ env.cache-name }}-${{ inputs.os }}-${{ inputs.ghc }}-${{ env.INDEX_STATE }}-${{ hashFiles('cabal.project.freeze') }}
+        restore-keys: |
+              ${{ inputs.cache-prefix }}${{ env.cache-name }}-${{ inputs.os }}-${{ inputs.ghc }}-${{ env.INDEX_STATE }}-
+              ${{ inputs.cache-prefix }}${{ env.cache-name }}-${{ inputs.os }}-${{ inputs.ghc }}-
+              ${{ inputs.cache-prefix }}${{ env.cache-name }}-${{ inputs.os }}-
+
     - uses: actions/setup-python@v3
     - uses: pre-commit/action@v3.0.0