Create msbuild.yml

.github/workflows/msbuild.yml

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+# This workflow uses actions that are not certified by GitHub.
+# They are provided by a third-party and are governed by
+# separate terms of service, privacy policy, and support
+# documentation.
+
+name: MSBuild
+
+on:
+  push:
+    branches: [ "master" ]
+  pull_request:
+    branches: [ "master" ]
+
+env:
+  # Path to the solution file relative to the root of the project.
+  SOLUTION_FILE_PATH: hl2.sln
+
+  # Configuration type to build.
+  # You can convert this to a build matrix if you need coverage of multiple configuration types.
+  # https://docs.github.com/actions/learn-github-actions/managing-complex-workflows#using-a-build-matrix
+  BUILD_CONFIGURATION: Release
+
+  # Build architecture
+  BUILD_PLATFORM: Win32
+
+permissions:
+  contents: read
+
+jobs:
+  build:
+    runs-on: windows-latest
+
+    steps:
+    - name: Checkout repository and submodules
+      uses: actions/checkout@v3
+      with:
+        submodules: recursive
+
+    - name: Add msbuild / cmake / nmake to PATH
+      uses: ilammy/msvc-dev-cmd@v1
+
+    - name: Build the app
+      working-directory: ${{env.GITHUB_WORKSPACE}}
+      # Add additional options to the MSBuild command line here (like platform or verbosity level).
+      # See https://docs.microsoft.com/visualstudio/msbuild/msbuild-command-line-reference
+      run: .\creategameprojects_debug.bat && msbuild /m /p:Configuration=${{env.BUILD_CONFIGURATION}} /p:Platform=${{env.BUILD_PLATFORM}} ${{env.SOLUTION_FILE_PATH}}

README.md

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-
+![CI](https://github.com/Source-Authors/obsolete-source-engine/actions/workflows/msbuild.yml/badge.svg?branch=master) Obsolete source
 ## How to build
 
 * [windows] Visual Studio 2022 with v143+ platform toolset.