Add CI pipeline

Signed-off-by: Severin Kaderli <severin@kaderli.dev>

.gitlab-ci.yml

@@ -0,0 +1,24 @@
+stages:
+  - Build
+  - Image
+
+Build:
+  image: registry.gitlab.com/severinkaderli/firu:master
+  stage: Build
+  script:
+    - firu
+  artifacts:
+    paths:
+      - .output/
+
+Image:
+  image: docker:19.03.8
+  stage: Image
+  services:
+    - docker:19.03.8-dind
+  variables:
+    IMAGE_TAG: $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_SLUG
+  script:
+    - docker login -u $CI_REGISTRY_USER -p $CI_REGISTRY_PASSWORD $CI_REGISTRY
+    - docker build -t $IMAGE_TAG .
+    - docker push $IMAGE_TAG