Update haskell.yml

.github/workflows/haskell.yml

@@ -149,9 +149,18 @@ jobs:
     #  with:
     #     limit-access-to-actor: true
 
+    - name: Force Cabal and HLS to populate their caches
+      if: runner.os == 'Linux' && (matrix.ghc == '8.10.7' || matrix.ghc == '9.6.2')
+      run: |
+        timeout 15m bash -c "nix develop github:input-output-hk/devx#${{ matrix.ghc == '8.10.7' && 'ghc810' || matrix.ghc == '9.6.2' && 'ghc96' }} --command bash -c 'cabal update; haskell-language-server --project-ghc-version'"
+      shell: bash
+
     - name: Cache build artifacts (used to speed up GitHub Codespaces bootstrapping)
       if: runner.os == 'Linux' && (matrix.ghc == '8.10.7' || matrix.ghc == '9.6.2')
       uses: actions/upload-artifact@v2
       with:
         name: cache-${{ github.sha }}-${{ matrix.ghc == '8.10.7' && 'ghc810' || matrix.ghc == '9.6.2' && 'ghc96' }}
-        path: ~/.cache
+        path: |
+          ~/.cache
+          ~/.cabal-devx
+          ./dist-newstyle