diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
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+# This CI file is used to test code pushed to "main".
+
+image: ubuntu:rolling # Using rolling because of that OpenSSL vuln.
+
+# Use Docker, because it just works.
+
+before_script:
+  - apt update # Build a package cache with apt, because Ubuntu on Docker doesn't have one by default.
+  - apt install git bash libpng-dev build-essential binutils-arm-none-eabi -y # Install build dependencies.
+  - git config --global http.sslVerify false # disable SSL for git so that cloning the game doesn't fudge everything up.
+
+build:
+  stage: build
+  script:
+    - echo "Do your build here"
+    - mkdir work-directory
+    - cd work-directory
+    - git clone --recursive https://gitgud.io/tbld/game.git # clone recursively so that we don't have to get agbcc ourselves
+    - cd game
+    - cd agbcc
+    - bash ./build.sh # Compile agbcc
+    - bash ./install.sh ../ # Install agbcc into tumbledemerald
+    - cd ..
+    - make -j8 # multi-threaded make