Add Ubuntu CI build and artifacts push

Author: aobolensk

.github/workflows/build.yml

@@ -0,0 +1,22 @@
+name: Build
+
+on: [push, pull_request]
+
+jobs:
+  ubuntu-build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+    - name: Setup environment
+      run: |
+        sudo add-apt-repository ppa:ubuntu-toolchain-r/test
+        sudo apt-get update
+        sudo apt-get install ninja-build
+        sudo apt-get install texlive*
+    - name: Build
+      run: |
+        find . -iname '*.tex' -exec pdflatex {} \;
+    - uses: actions/upload-artifact@v4
+      with:
+        name: pdf-linux
+        path: '*.pdf'