Setup GitHub Actions for Linux builds (#723)

* Create cmake-lx.yml

* Update cmake-lx.yml

* Update cmake-lx.yml

.github/workflows/cmake-lx.yml

@@ -0,0 +1,60 @@
+name: CMake Linux
+
+on: [push]
+
+env:
+  # Customize the CMake build type here (Release, Debug, RelWithDebInfo, etc.)
+  BUILD_TYPE: Release
+
+jobs:
+  build:
+    # The CMake configure and build commands are platform agnostic and should work equally
+    # well on Windows or Mac.  You can convert this to a matrix build if you need
+    # cross-platform coverage.
+    # See: https://docs.github.com/en/actions/configuring-and-managing-workflows/configuring-a-workflow#configuring-a-build-matrix
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    
+    - name: Install Dependencies
+      run: |
+        sudo apt-get update
+        sudo apt-get install -y libmpg123-dev libvorbis-dev libavformat-dev libavcodec-dev libavutil-dev libswresample-dev
+        sudo apt-get install -y libao-dev audacious-dev libjansson-dev
+
+    - name: Create Build Environment
+      # Some projects don't allow in-source building, so create a separate build directory
+      # We'll use this as our working directory for all subsequent commands
+      run: cmake -E make_directory ${{runner.workspace}}/build
+
+    - name: Configure CMake
+      # Use a bash shell so we can use the same syntax for environment variable
+      # access regardless of the host operating system
+      shell: bash
+      working-directory: ${{runner.workspace}}/build
+      # Note the current convention is to use the -S and -B options here to specify source 
+      # and build directories, but this is only available with CMake 3.13 and higher.  
+      # The CMake binaries on the Github Actions machines are (as of this writing) 3.12
+      run: cmake $GITHUB_WORKSPACE -DCMAKE_BUILD_TYPE=$BUILD_TYPE
+
+    - name: Build
+      working-directory: ${{runner.workspace}}/build
+      shell: bash
+      # Execute the build.  You can specify a specific target with "--target <NAME>"
+      run: cmake --build . --config $BUILD_TYPE
+        
+    - name: Upload CLI Tool Artifacts
+      uses: actions/upload-artifact@v2
+      with:
+          path: |
+            ${{runner.workspace}}/build/cli/vgmstream_cli
+            ${{runner.workspace}}/build/cli/vgmstream123      
+          name: vgmstream_cli
+          
+    - name: Upload Audacious Plugin Artifact
+      uses: actions/upload-artifact@v2
+      with:
+          path: ${{runner.workspace}}/build/audacious/vgmstream.so
+          name: vgmstream-audacious
+