Update CI workflows

Author: hyazinthh

.github/workflows/build.yml

@@ -0,0 +1,32 @@
+name: Build
+on:
+  push:
+    paths-ignore:
+    - 'README.md'
+    - 'docs/'
+  pull_request:
+    paths-ignore:
+    - 'README.md'
+    - 'docs/'
+jobs:
+  build:
+    runs-on: ${{ matrix.os }}
+    strategy:
+        matrix:
+            os: [ubuntu-latest, windows-latest, macos-latest]
+            include:
+              - os: ubuntu-latest
+                build: sh ./build.sh
+              - os: windows-latest
+                build: .\build.cmd
+              - os: macos-latest
+                build: bash ./build.sh
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v4
+    - name: Install Dotnet
+      uses: actions/setup-dotnet@v4
+      with:
+        global-json-file: global.json
+    - name: Build
+      run: ${{ matrix.build }}

.github/workflows/linux.yml

@@ -1,9 +1,7 @@
 # Aardvark.OpenCV
 
+![Build](https://github.com/aardvark-platform/aardvark.opencv/workflows/Build/badge.svg)
 ![Publish](https://github.com/aardvark-platform/aardvark.opencv/workflows/Publish/badge.svg)
-![Windows](https://github.com/aardvark-platform/aardvark.opencv/workflows/Windows/badge.svg)
-![MacOS](https://github.com/aardvark-platform/aardvark.opencv/workflows/MacOS/badge.svg)
-![Linux](https://github.com/aardvark-platform/aardvark.opencv/workflows/Linux/badge.svg)
 
 
 [![NuGet](https://badgen.net/nuget/v/Aardvark.OpenCV)](https://www.nuget.org/packages/Aardvark.OpenCV/)