Add Linux CI (via GitHub Actions) (#4)

* Created build.yml (Linux CI)

.github/workflows/build.yml

@@ -0,0 +1,44 @@
+name: NDSFactory-Builds
+
+on: [push]
+
+env:
+  BUILD_TYPE: Release
+
+jobs:
+  build-linux:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Create Build Environment
+      run: |
+        sudo apt-get update
+        sudo apt-get install -y build-essential qt5-default cmake
+        mkdir build
+
+    - name: Configure CMake
+      working-directory: ${{github.workspace}}/build
+      shell: bash
+      run: |
+        cmake -DCMAKE_BUILD_TYPE=$BUILD_TYPE ..
+
+    - name: Build
+      working-directory: ${{github.workspace}}/build
+      shell: bash
+      run: |
+        make -j4
+        
+    - name: Archive Artifact
+      working-directory: ${{github.workspace}}/build
+      shell: bash
+      run: |
+        tar -czvf NDSFactory_`date +%Y%m%d`__Linux_x86_64.tar.gz NDSFactory ../README.md ../LICENSE
+
+    - name: Upload Artifact
+      uses: actions/upload-artifact@v2
+      with:
+        name: Linux
+        path: build/NDSFactory_*__Linux_x86_64.tar.gz
+        if-no-files-found: error