ci: Add FileCopyMethod to the matrix

Author: eth-p

.github/workflows/go.yml

@@ -20,8 +20,10 @@ jobs:
          - runner: windows-latest
          - runner: macos-latest
            filesystem: APFS
+           copymethod: GetBytes
          - runner: ubuntu-latest
            filesystem: btrfs
+           copymethod: GetBytes
         go: ['1.18', '1.19', '1.20']
     steps:
     - name: Set up Go
@@ -78,6 +80,7 @@ jobs:
       working-directory: ${{ env.TEST_PATH }}
       env:
         TEST_FILESYSTEM: ${{ matrix.os.filesystem }}
+        TEST_FILECOPYMETHOD: ${{ matrix.os.copymethod }}
       run: go test -v --tags=go${{ matrix.go }}
   benchmark:
     name: Benchmark