Codefix: [CI] Store vcpkg outside the repository folder (#12271)

Otherwise tools like CodeQL can pick up on vcpkg files.

.github/workflows/ci-linux.yml

@@ -42,8 +42,8 @@ jobs:
 
     - name: Install vcpkg
       run: |
-        git clone https://github.com/microsoft/vcpkg
-        ./vcpkg/bootstrap-vcpkg.sh -disableMetrics
+        git clone https://github.com/microsoft/vcpkg ${{ runner.temp }}/vcpkg
+        ${{ runner.temp }}/vcpkg/bootstrap-vcpkg.sh -disableMetrics
 
     - name: Install dependencies
       run: |
@@ -71,7 +71,7 @@ jobs:
 
         # We only use breakpad from vcpkg, as its CMake files
         # are a bit special. So the Ubuntu's variant doesn't work.
-        ./vcpkg/vcpkg install breakpad
+        ${{ runner.temp }}/vcpkg/vcpkg install breakpad
 
         echo "::endgroup::"
       env:
@@ -101,7 +101,7 @@ jobs:
         cd build
 
         echo "::group::CMake"
-        cmake .. -DCMAKE_TOOLCHAIN_FILE=${GITHUB_WORKSPACE}/vcpkg/scripts/buildsystems/vcpkg.cmake ${{ inputs.extra-cmake-parameters }}
+        cmake .. -DCMAKE_TOOLCHAIN_FILE=${{ runner.temp }}/vcpkg/scripts/buildsystems/vcpkg.cmake ${{ inputs.extra-cmake-parameters }}
         echo "::endgroup::"
 
         echo "::group::Build"