.github/workflows/swift: install swift-format via Linux homebrew

Author: ydnar

.github/workflows/swift.yaml

@@ -23,9 +23,10 @@ jobs:
           submodules: recursive
 
       - name: Install swift-format
-        uses: Cyberbeni/install-swift-tool@v2
-        with:
-          url: https://github.com/apple/swift-format
+        run: /home/linuxbrew/.linuxbrew/bin/brew install swift-format
+        # uses: Cyberbeni/install-swift-tool@v2
+        # with:
+        #   url: https://github.com/apple/swift-format
 
       - name: Format Swift code
         run: swift-format -r -i ./