arm64: make sure the cache size stays in check

since we disable caching now we also no longer prune the cache

Author: lazka

.github/workflows/build.yml

@@ -165,6 +165,13 @@ jobs:
         msys2 -c 'pacman --noconfirm -Suu'
         msys2 -c 'pacman -Qkq'
 
+    - name: Prune cache for ARM64
+      if: ${{ runner.arch == 'ARM64' }}
+      shell: msys2 {0}
+      run: |
+        # Remove all cached packages older then 14 days
+        paccache -r --min-atime "14 days ago" -k0
+
     - name: Process build queue
       env:
         GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}