Update build workflown

Author: Kartatz

.github/workflows/build.yml

@@ -0,0 +1,52 @@
+name: Build
+
+on:
+  push:
+    branches:
+        - '**'
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        target: [
+          alpha-unknown-linux-gnu,
+          x86_64-unknown-linux-gnu,
+          i386-unknown-linux-gnu,
+          arm-unknown-linux-gnueabi,
+          arm-unknown-linux-gnueabihf,
+          hppa-unknown-linux-gnu,
+          aarch64-unknown-linux-gnu,
+          mips-unknown-linux-gnu,
+          mipsel-unknown-linux-gnu,
+          powerpc-unknown-linux-gnu,
+          s390-unknown-linux-gnu,
+          s390x-unknown-linux-gnu,
+          sparc-unknown-linux-gnu,
+          powerpc64le-unknown-linux-gnu
+        ]
+    steps:
+    - uses: actions/checkout@main
+      with:
+        submodules: true
+    - name: Install required dependencies
+      run: |
+        sudo apt-get install --assume-yes libfl-dev
+    - name: Build Atar with OBGGCC
+      run: |
+        source './tools/setup_toolchain.sh'
+        source './submodules/obggcc/tools/setup_toolchain.sh'
+        
+        bash './build.sh' '${{ matrix.target }}'
+    - name: Generate tarball
+      run: |
+        declare tarball_filename='${{ matrix.target }}.tar.xz'
+        tar --directory='/tmp' --create --file=- 'atar' |  xz --threads=0 --compress -9 > "${tarball_filename}"
+        sha256sum "${tarball_filename}" > "${tarball_filename}.sha256"
+    - name: Upload artifact
+      uses: actions/upload-artifact@main
+      with:
+        path: |
+          ${{ matrix.target }}.tar.xz
+          ${{ matrix.target }}.tar.xz.sha256