ci: Add MASM to build PATH and allow to build!

Author: dimhotepus

.github/actions/build-shared/action.yml

@@ -15,11 +15,16 @@ inputs:
 runs:
   using: "composite"
   steps:
-  - name: Add MSBuild to PATH
+  - name: Add MSBuild ${{matrix.platform-name}} to PATH
     uses: microsoft/setup-msbuild@v2
     with:
       msbuild-architecture: ${{matrix.platform-name}}
 
+  - name: Add MASM ${{matrix.platform-name}} to PATH
+    uses: Source-Authors/setup-masm@v1.1
+    with:
+      vs-architecture: ${{matrix.platform-name}}
+
   - name: Add cmake / nmake to PATH
     uses: ilammy/msvc-dev-cmd@v1
     with: