CI: {bench,hackage} add Linux platform config

For future caching configuraiton.

Author: Anton-Latukha

.github/workflows/bench.yml

@@ -53,6 +53,10 @@ jobs:
         enable-stack: false
 
     - name: Cache Cabal
+    - name: Linux Platform config
+      run: |
+        echo "CABAL_PKGS_DIR=~/.cabal/packages" >> $GITHUB_ENV
+
       uses: actions/cache@v2
       with:
         path: |

.github/workflows/hackage.yml

@@ -55,6 +55,10 @@ jobs:
           enable-stack: false
 
       - name: Cache Cabal
+      - name: Linux Platform config
+        run: |
+          echo "CABAL_PKGS_DIR=~/.cabal/packages" >> $GITHUB_ENV
+
         uses: actions/cache@v2
         env:
           cache-name: cache-cabal