Fix CI Ccache path

Author: zfergus

.github/workflows/continuous.yml

@@ -40,18 +40,15 @@ jobs:
       - name: Dependencies (Linux)
         if: runner.os == 'Linux'
         run: |
-            sudo apt-get update &&
-            sudo apt-get install \
-            xorg-dev \
-            libsuitesparse-dev \
-            libblas-dev \
-            libglu1-mesa-dev \
-            liblapack-dev \
-            ccache
+            sudo apt-get update
+            sudo apt-get install xorg-dev libsuitesparse-dev libblas-dev libglu1-mesa-dev liblapack-dev ccache
+            echo 'CACHE_PATH=~/.cache/ccache' >> "$GITHUB_ENV"
 
       - name: Dependencies (macOS)
         if: runner.os == 'macOS'
-        run: brew install suite-sparse ccache
+        run: |
+          brew install suite-sparse ccache
+          echo 'CACHE_PATH=~/Library/Caches/ccache' >> "$GITHUB_ENV"
 
       - name: Cache Build
         id: cache-build