Add CI pipelines for Drone and GitHub Actions

.github/workflows/latex.yml

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+name: Latex
+
+# Controls when the action will run. 
+on:
+  # Triggers the workflow on push or pull request events but only for the master branch
+  push:
+    branches: [ main ]
+
+  # Allows you to run this workflow manually from the Actions tab
+  workflow_dispatch:
+
+# A workflow run is made up of one or more jobs that can run sequentially or in parallel
+jobs:
+  # This workflow contains a single job called "build"
+  build:
+    # The type of runner that the job will run on
+    runs-on: ubuntu-latest
+    container:
+      image: fastexitlane/pandoc-latex:latest
+    steps:
+      - uses: actions/checkout@v2
+
+      - run: ./build.sh pandoc
+
+      - uses: actions/upload-artifact@v2
+        with:
+          name: Studienarbeit.pdf
+          path: out/main.pdf