add nsis install step

Author: gittiver

.github/workflows/build_and_test.yml

@@ -60,6 +60,12 @@ jobs:
          fi
       shell: bash
 
+    - name: Install NSIS
+      if: matrix.os == 'windows-latest'
+      uses: repolevedavaj/install-nsis@v1.1.0
+      with:
+        nsis-version: '3.10'
+
     - name: Configure CMake
       run: |
          cmake_flags=""