Added PR build action

.github/workflows/build-pr.yml

@@ -0,0 +1,30 @@
+name: Build Pull Request
+
+on:
+  pull_request:
+    branches:
+      - master
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    container:
+      image: ghcr.io/dash-industry-forum/dashif-specs:latest
+      credentials:
+        username: ${{ github.actor }}
+        password: ${{ secrets.github_token }}
+
+    steps:
+    - uses: actions/checkout@v4
+    - name: Build
+      env:
+        # Reset OPTS to empty to make sure we are not using
+        # interactive mode in CI
+        OPTS:
+      run: make -f /tools/Makefile spec SRC=Cpix.bs.md NAME=cpix
+
+    - name: Archive
+      uses: actions/upload-artifact@v4
+      with:
+        name: dist
+        path: dist/