[CI] Include a static build in continuous integration (#113)

* [CI] Include a static build in continuous integration

Co-authored-by: Stephen Webb <stephen.webb@sabreautonomous.com.au>
diff --git a/.github/workflows/log4cxx.yml b/.github/workflows/log4cxx.yml
index 906d346..6ab2e26 100644
--- a/.github/workflows/log4cxx.yml
+++ b/.github/workflows/log4cxx.yml
@@ -60,7 +60,7 @@
       uses: actions/cache@v2
       with:
         path: vcpkg
-        key: ${{ runner.os }}-${{ matrix.name }}-cache
+        key: ${{ runner.os }}-${{ matrix.name }}-cache-x64
 
     - name: 'Checkout VCPKG - Windows'
       if: (matrix.name == 'windows-2019' || matrix.name == 'windows-2016') && steps.restore-vcpkg-cache.outputs.cache-hit != 'true'
@@ -78,6 +78,7 @@
         cd vcpkg
         ./bootstrap-vcpkg.bat
         ./vcpkg install apr apr-util --triplet=x64-windows
+        ./vcpkg install apr apr-util --triplet=x64-windows-static
 
     - name: 'run cmake - win'
       if: (matrix.name == 'windows-2019' || matrix.name == 'windows-2016') 
@@ -90,6 +91,17 @@
         cmake -DLOG4CXX_TEST_PROGRAM_PATH=C:\msys64\usr\bin "-DCMAKE_TOOLCHAIN_FILE=$THISDIR/vcpkg/scripts/buildsystems/vcpkg.cmake" -DCMAKE_CXX_COMPILER=${{ matrix.cxx }} -DCMAKE_C_COMPILER=${{ matrix.cc }} ..
         cmake --build .
 
+    - name: 'run cmake - win-static'
+      if: matrix.name == 'windows-2019'
+      shell: pwsh
+      run: |
+        $THISDIR=Get-Location
+        cd main
+        mkdir build-static
+        cd build-static
+        cmake -DBUILD_SHARED_LIBS=off -DLOG4CXX_TEST_PROGRAM_PATH=C:\msys64\usr\bin "-DCMAKE_TOOLCHAIN_FILE=$THISDIR/vcpkg/scripts/buildsystems/vcpkg.cmake" -DCMAKE_CXX_COMPILER=${{ matrix.cxx }} -DCMAKE_C_COMPILER=${{ matrix.cc }} ..
+        cmake --build .
+
     - name: 'run cmake - *nix'
       if: matrix.name != 'windows-2019'
       run: |