ci(.gitlab-ci): use Docker images for builds

.gitlab-ci.yml

@@ -3,6 +3,7 @@ image: python:3.13-slim
 
 stages:
   - prebuild
+  - pdf
   - build
   - deploy
   - deploy-pages
@@ -14,53 +15,73 @@ variables:
 
 prebuild:
   before_script:
-    - apt-get update && apt-get install -y pandoc python3-pip texlive-latex-base texlive-fonts-recommended texlive-fonts-extra texlive-latex-extra
+    - apt-get update && apt-get install -y python3-pip
     - python3 -m pip install poetry
-    - pandoc -v
     - poetry --version
   stage: prebuild
   script: |
     # Run the build script
     ./build.sh
-    echo "Generate Decks as PDF with Pandoc. It is generated as a backup."
-    pandoc -t beamer $PREBUILD_OUTPUT/fvv-folien-deck.md -o $PREBUILD_OUTPUT/fvv-folien.pdf
   artifacts:
     paths:
       - $PREBUILD_OUTPUT
     expire_in: "1 hour"
 
-build:
-  image: ubuntu:24.04
-  stage: build
-  cache:
-    key: decker-cache
-    paths:
-      - .cache/decker/
-    policy: pull-push
-  before_script:
-    - mkdir -p .cache/decker
-    - |
-      if [ ! -f .cache/decker/decker ]; then
-        echo "Downloading decker..."
-        apt-get update && apt-get install -y curl
-        curl -L -o .cache/decker/decker https://github.com/decker-edu/decker/releases/download/latest/decker-latest-Linux-X64-3f4150d61ca167361b02665da969da769ca98e7c
-        chmod +x .cache/decker/decker
-      else
-        echo "Using cached decker binary"
-      fi
+pdf:
+  image: registry.gitlab.fachschaften.org/robinst/pandoc-image:latest
+  stage: pdf
   dependencies:
     - prebuild
-  script: |
-    cd $PREBUILD_OUTPUT
-    echo "Generate Decks with Decker."
-    ../.cache/decker/decker decks
-    echo "Successfully built Decker slides."
-    cp fvv-folien.pdf public/fvv-folien.pdf
+  script:
+    - echo "Generate Decks as PDF with Pandoc. It is generated as a backup."
+    - pandoc -t beamer $PREBUILD_OUTPUT/fvv-folien-deck.md -o $PREBUILD_OUTPUT/fvv-folien.pdf
+    - ls
   artifacts:
     paths:
-      - $BUILD_OUTPUT
+      - $PREBUILD_OUTPUT
     expire_in: "1 hour"
 
+# build:
+#   image: ubuntu:24.04
+#   stage: build
+#   cache:
+#     key: decker-cache
+#     paths:
+#       - .cache/decker/
+#     policy: pull-push
+#   before_script:
+#     - mkdir -p .cache/decker
+#     - |
+#       if [ ! -f .cache/decker/decker ]; then
+#         echo "Downloading decker..."
+#         apt-get update && apt-get install -y curl
+#         curl -L -o .cache/decker/decker https://github.com/decker-edu/decker/releases/download/latest/decker-latest-Linux-X64-3f4150d61ca167361b02665da969da769ca98e7c
+#         chmod +x .cache/decker/decker
+#       else
+#         echo "Using cached decker binary"
+#       fi
+#   dependencies:
+#     - pdf
+#   script: |
+#     cd $PREBUILD_OUTPUT
+#     echo "Generate Decks with Decker."
+#     ../.cache/decker/decker decks
+#     echo "Successfully built Decker slides."
+#     cp fvv-folien.pdf public/fvv-folien.pdf
+#   artifacts:
+#     paths:
+#       - $BUILD_OUTPUT
+#     expire_in: "1 hour"
+
+build:
+  image: registry.gitlab.fachschaften.org/robinst/decker-image:1.0.0
+  stage: build
+  dependencies:
+    - pdf
+  script:
+    - ls
+    - /usr/local/decker -h
+
 deploy:
   stage: deploy
   dependencies: