Install NSIS on windows.

.github/workflows/build.yml

@@ -43,13 +43,16 @@ jobs:
         with:
           version: ${{ env.QT_VERSION }}
 
-      # Windows
-
-      - name: Chocolatey Action
+      - name: Install pkgconfiglite
         if: matrix.os == 'windows-latest'
         uses: crazy-max/ghaction-chocolatey@v2
         with:
           args: install pkgconfiglite --checksum e87b5ea3c9142256af60f2d5b917aa63b571e6a0 --checksum-type sha1
+      - name: Install nsis
+        if: matrix.os == 'windows-latest'
+        uses: crazy-max/ghaction-chocolatey@v2
+        with:
+          args: install nsis
 
       - name: Install Debian packaging dependencies
         if: matrix.os == 'ubuntu-latest'