Add build workflow

.github/workflows/build.yml

@@ -0,0 +1,33 @@
+name: LaTeX Build
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Set up LaTeX
+        uses: xu-cheng/latex-action@v3
+        with:
+          pdflatex-xelatex: pdflatex
+
+      - name: Compile LaTeX document
+        run: |
+          pdflatex -interaction=nonstopmode -shell-escape cnc-fräse/cnc-fräse.tex
+
+      - name: Upload PDFs.
+        uses: actions/upload-artifact@v4
+        with:
+          name: PDFs
+          path: "*.pdf"
+          retention-days: 5
+          if-no-files-found: error