Add gitlab ci workflow

Change-Id: I78b1aefdc6d413d1aafc5d8f524f3d36368baae3
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
new file mode 100644
index 0000000..166434c
--- /dev/null
+++ b/.gitlab-ci.yml
@@ -0,0 +1,59 @@
+# use the verse rocker image, as it contains tidyverse, devtools and some texlive
+image: rocker/verse
+
+# define stages of runner. at the moment,
+# just build (no test or deploy).
+stages:
+  - build
+
+build-job:
+  stage: build
+
+  cache:
+    key: icc
+    paths:
+      - ./cache
+
+  artifacts:
+    paths:
+      - "target/*"
+
+  before_script:
+    - source `find .. -name section_helper.sh`
+
+    - start_section install_linux_packages "Installing missing Linux packages"
+    - apt-get update
+    - apt-get install -y build-essential libglpk40 libcurl4-gnutls-dev libxml2-dev libsodium-dev libsecret-1-dev libfontconfig1-dev libssl-dev libxt6 libpq-dev imagemagick ghostscript software-properties-common inkscape scour
+    - add-apt-repository ppa:saiarcot895/chromium-beta
+    - apt update
+    - apt install -y chromium-browser
+    - locale-gen de_DE.utf8 en_GB.utf8 en_US.utf8
+    - end_section install_linux_packages
+
+    - start_section install_fonts "Installing Libertinus and Fira fonts"
+    - wget -O- https://github.com/mozilla/Fira/archive/refs/tags/4.202.tar.gz | tar -C /usr/share/fonts -zx --wildcards "*.otf"
+    - fc-cache
+    - end_section install_fonts
+
+    - start_section testing_chromium Testing chromium PDF export
+    - chromium-browser --headless --no-sandbox --disable-gpu --run-all-compositor-stages-before-draw --no-pdf-header-footer --print-to-pdf=./test.pdf https://www.ids-mannheim.de/
+    - ls -l ./test.pdf
+    - end_section testing_chromium
+
+    - start_section install_r_packages "Installing missing R packages"
+    - R -e "install.packages(c('scales', 'sp', 'raster', 'kableExtra', 'DT', 'svglite'))"
+    - R -e 'devtools::install_git("https://korap.ids-mannheim.de/gerrit/IDS-Mannheim/idsThemeR")'
+    - R -e 'devtools::install_git("https://korap.ids-mannheim.de/gerrit/IDS-Mannheim/posterdown")'
+    - end_section install_r_packages
+
+  script:
+    - start_section installing "Installing posterdown (ids)"
+    - R -e 'devtools::install()'
+    - end_section installing
+    - start_section render "Generating demo artifacts"
+    - R_CACHE_ROOTPATH=./cache R -e "require(rmarkdown); render('inst/rmarkdown/templates/posterdown_ids/skeleton/skeleton.Rmd', output_format='posterdown::posterdown_ids', output_dir='target')"
+    - ./ci/html2pdf target/skeleton.html target/skeleton.pdf 1
+    - inkscape -b white --pdf-poppler -o target/skeleton.svg target/skeleton.pdf || true
+    - scour -i target/skeleton.svg -o target/skeleton_optimized.svg --enable-viewboxing --enable-id-stripping --shorten-ids --indent=none
+    - end_section render
+