(#22) Use the provided scripts

instead of the dotnet tool.
Using dotnet tool requires Cake.Recipe v2.x
Also switched from "CI" target to the old "AppVeyor" target.
The name was changed from AppVeyor to CI in Cake.Recipe 2.0.0

.github/workflows/build.yml

@@ -46,14 +46,25 @@ jobs:
           path: tools
           key: ${{ runner.os }}-tools-${{ hashFiles('recipe.cake') }}
 
+#      - name: Build project
+#        uses: cake-build/cake-action@v1
+#        with:
+#          script-path: recipe.cake
+#          target: CI
+#          verbosity: Normal
+#          cake-version: 0.38.5
+#          cake-bootstrap: true
+
       - name: Build project
-        uses: cake-build/cake-action@v1
-        with:
-          script-path: recipe.cake
-          target: CI
-          verbosity: Normal
-          cake-version: 0.38.5
-          cake-bootstrap: true
+        if: runner.os != 'Windows'
+        run: |
+          ./build.sh --bootstrap
+          ./build.sh --target=AppVeyor
+      - name: Build project
+        if: runner.os == 'Windows'
+        run: |
+          ./build.ps1 --bootstrap
+          ./build.ps1 --target=AppVeyor
 
       - name: Upload Issues-Report
         uses: actions/upload-artifact@v2
@@ -63,6 +74,7 @@ jobs:
           path: BuildArtifacts/report.html
 
       - name: Upload Packages
+        if: runner.os == 'Windows'
         uses: actions/upload-artifact@v2
         with:
           if-no-files-found: warn