Update release-build.yml

.github/workflows/release-build.yml

@@ -28,6 +28,7 @@ jobs:
           body: |
               Files included in this release:
               - `BeamMP-Launcher.exe` windows build
+              - `BeamMP-Launcher` linux build
 
   upload-release-files-windows:
     name: Upload Windows Release Files
@@ -70,3 +71,34 @@ jobs:
           asset_path: ${{github.workspace}}/build-windows/Release/BeamMP-Launcher.exe
           asset_name: BeamMP-Launcher.exe
           asset_content_type: application/vnd.microsoft.portable-executable
+
+  upload-release-files-linux:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+        with:
+            submodules: 'true'
+
+      - name: Create Build Environment
+        run: cmake -E make_directory ${{github.workspace}}/build-linux
+
+      - name: Configure CMake
+        shell: bash
+        working-directory: ${{github.workspace}}/build-linux
+        run: cmake $GITHUB_WORKSPACE -DCMAKE_BUILD_TYPE=$BUILD_TYPE
+
+      - name: Build
+        working-directory: ${{github.workspace}}/build-linux
+        shell: bash
+        run: cmake --build . --config $BUILD_TYPE
+        
+      - name: Upload Release Asset
+        id: upload-release-asset 
+        uses: actions/upload-release-asset@v1
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          upload_url: ${{ needs.create-release.outputs.upload_url }} # This pulls from the CREATE RELEASE step above, referencing it's ID to get its outputs object, which include a `upload_url`. See this blog post for more info: https://jasonet.co/posts/new-features-of-github-actions/#passing-data-to-future-steps 
+          asset_path: ${{github.workspace}}/build-linux/BeamMP-Launcher
+          asset_name: BeamMP-Launcher
+          asset_content_type: application/octet-stream