Improve ARM Darwin CI stability (#586)

- Isolate local homebrew cache directory from the host environment
- Weekly refresh homebrew cache

.github/workflows/ci.yaml

@@ -50,6 +50,8 @@ jobs:
           - '1.21'
     runs-on: ${{ matrix.runs-on }}
     name: Darwin Go ${{ matrix.go }} ${{ join(matrix.runs-on, ' ') }}
+    env:
+      HOMEBREW_CACHE: ${{ github.workspace }}/brew-cache
     steps:
       - name: Checkout
         uses: actions/checkout@v4
@@ -68,14 +70,19 @@ jobs:
       - name: Local brew cache key
         if: matrix.runs-on != 'macos-latest'
         id: brew-cache-key
-        run: echo "key=$(date +'%Y-%U')" | tee ${GITHUB_OUTPUT} # weekly update cache
+        run: echo "key=$(date +'%Y-%U')" | tee ${GITHUB_OUTPUT} # weekly refresh the cache
+      - name: Cache brew
+        if: matrix.runs-on != 'macos-latest'
+        uses: actions/cache@v4
+        with:
+          path: ${{ env.HOMEBREW_CACHE }}
+          key: ${{ runner.os }}-brew-cache-${{ steps.brew-cache-key.outputs.key }}
       - name: Cache local brew taps
         if: matrix.runs-on != 'macos-latest'
         uses: actions/cache@v4
         with:
           path: homebrew/Library/Taps
           key: ${{ runner.os }}-brew-taps-${{ steps.brew-cache-key.outputs.key }}
-          restore-keys: ${{ runner.os }}-brew-taps-
       - name: Set up brew to install deps under temporary dir
         if: matrix.runs-on != 'macos-latest'
         run: |