CI: test: mk some platform-specific setup declarative

`!= 'windows-latest` may mean not latest or not windows, but the setup is for
Linux & macOS.

Author: Anton-Latukha

.github/workflows/cache-deps.yml

@@ -68,8 +68,8 @@ jobs:
           echo "CABAL_STORE_DIR=$SYSTEMDRIVE\\SR" >> $GITHUB_ENV
           echo "CABAL_PKGS_DIR=~\\AppData\\cabal\\packages" >> $GITHUB_ENV
 
-      - if: matrix.os != 'windows-latest'
-        name: Set some linux/macOS specific things
+      - if: (${{ env.RUNNER_OS }} == 'Linux') || (${{ env.RUNNER_OS}} == 'macOS')
+        name: Set some Linux/macOS specific things
         run: |
           echo "CABAL_STORE_DIR=~/.cabal/store" >> $GITHUB_ENV
           echo "CABAL_PKGS_DIR=~/.cabal/packages" >> $GITHUB_ENV

.github/workflows/test.yml

@@ -85,14 +85,15 @@ jobs:
       - run: ./fmt.sh
         name: "HLint via ./fmt.sh"
 
-      - if: matrix.os == 'windows-latest'
+      - if: ${{ env.RUNNER_OS }} == 'Windows'
         name: Set some window specific things
         run: |
           echo "CABAL_STORE_DIR=$SYSTEMDRIVE\\SR" >> $GITHUB_ENV
           echo "CABAL_PKGS_DIR=~\\AppData\\cabal\\packages" >> $GITHUB_ENV
 
-      - if: matrix.os != 'windows-latest'
-        name: Set some linux/macOS specific things
+
+      - if: (${{ env.RUNNER_OS }} == 'Linux') || (${{ env.RUNNER_OS}} == 'macOS')
+        name: Set some Linux/macOS specific things
         run: |
           echo "CABAL_STORE_DIR=~/.cabal/store" >> $GITHUB_ENV
           echo "CABAL_PKGS_DIR=~/.cabal/packages" >> $GITHUB_ENV