ci: build and push docker image

Signed-off-by: Vojtech Mares <iam@vojtechmares.com>

.gitlab-ci.yml

@@ -0,0 +1,18 @@
+default:
+  image: ubuntu:22.04
+
+stages:
+  - build
+  - deploy
+
+build:
+  stage: build
+  variables:
+    IMAGE: $CI_REGISTRY_IMAGE
+    TAG: $CI_COMMIT_BRANCH-$CI_COMMIT_SHORT_SHA
+  before_script:
+    - echo $CI_REGISTRY_PASSWORD | docker login -u $CI_REGISTRY_USER --password-stdin $CI_REGISTRY
+    - docker info
+  script:
+    - docker build -t $IMAGE:$TAG .
+    - docker push $IMAGE:$TAG