Updated the workflow

.github/workflows/latex-ci.yml

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+name: LaTeX CI
+on:
+  pull_request:
+    branches:
+      - main
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        tex:
+          - test/testLecture.tex
+          - test/testExercise.tex
+          - test/testExam.tex
+    steps:
+      - uses: actions/checkout@v4
+      - name: Submodule-like setup
+        run: |
+          mkdir -p ../course_template
+          rsync -av --exclude='.git' . ../course_template/
+          mkdir -p summer2024/fig
+          mkdir -p ../../course_template
+          ln -s "$PWD/theme" ../../course_template/theme || true
+          ln -s "$PWD/style" ../../course_template/style || true
+      - uses: xu-cheng/latex-action@v3
+        with:
+          root_file: ${{ matrix.tex }}
+          args: -pdf -interaction=nonstopmode -halt-on-error -shell-escape

test/testExam.tex

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+\documentclass[solution, unisiegen-IAS]{../course_template/examClass}
+\title{Exam Test}
+\begin{document}
+\ex{Part 1}
+\task{A}
+  \subtask{Q1}{2}
+  \begin{solutionblock}Ans\end{solutionblock}
+\end{document}

test/testExercise.tex

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+\documentclass[solution, unisiegen-IAS]{../course_template/exerciseClass}
+\title{Exercise Test}
+\begin{document}
+\ex{Basics}
+\task{A}
+  Text
+  \begin{solutionblock}Solution\end{solutionblock}
+\end{document}

test/testLecture.tex

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+\documentclass[unisiegen-IAS]{../course_template/lectureClass}
+\title{Lecture Test}\author{CI}\date{\today}
+\makeglossaries
+\begin{document}
+\begin{frame}{Hello}
+  Test slide
+\end{frame}
+\end{document}