Add CI pipelines for Drone and GitHub Actions

.drone.yml

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+kind: pipeline
+type: docker
+name: test
+
+steps:
+  - name: hunspell_chapters
+    image: fastexitlane/hunspell:latest
+    commands:
+      - export HUNSPELL_FINDINGS=`for filename in chapter/*.md; do hunspell -l -d de_DE_frami,en_US -p ./.hunspellignore $filename; done | sort | uniq`
+      - echo $HUNSPELL_FINDINGS
+      - '[ -z "$HUNSPELL_FINDINGS" ] && exit 0 || exit 1'
+    failure: ignore
+  - name: hunspell_appendix
+    image: fastexitlane/hunspell:latest
+    commands:
+      - export HUNSPELL_FINDINGS=`for filename in appendix/*.tex; do hunspell -l -d de_DE_frami,en_US -p ./.hunspellignore -t $filename; done | sort | uniq`
+      - echo $HUNSPELL_FINDINGS
+      - '[ -z "$HUNSPELL_FINDINGS" ] && exit 0 || exit 1'
+    failure: ignore
+
+---
+kind: pipeline
+type: docker
+name: build
+
+steps:
+- name: pandoc
+  image: fastexitlane/pandoc-latex:latest
+  commands:
+    - ./build.sh pandoc
+    - ci_commit_sha_short=`git rev-parse --short $CI_COMMIT_SHA`
+- name: gitea_release
+  image: plugins/gitea-release
+  settings:
+    api_key:
+      from_secret: gitea_token
+    base_url: https://git.kingofdog.de
+    files:
+      - main.pdf
+
+trigger:
+  branch:
+    - main

.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