ci: replace docker with buildah

.gitlab-ci.yml

@@ -3,41 +3,25 @@ image: $CI_REGISTRY/ict/alpine-docker-images/ci:3.17
 stages:
   - deploy
-.docker: &docker_template
-  cache: {}  # disable
-  variables:
-    DOCKER_DRIVER: overlay2
-    DOCKER_HOST: tcp://docker:2375
-    DOCKER_TLS_CERTDIR: ""
-
-  services:
-    - name: gitlab.fit.cvut.cz:5000/algorithms-library-toolkit/infrastructure/ci-docker-images/docker:dind
-      alias: docker
-  before_script:
-    - apk add --no-cache docker
-    - docker info
-    - docker login -u gitlab-ci-token -p $CI_JOB_TOKEN $CI_REGISTRY
-  dependencies: []
-
 .push-only-job: &push-only-job
-  <<: *docker_template
   stage: deploy
+  image: $CI_REGISTRY/ict/images/buildah:v1
   script:
     - IMAGE="${CI_JOB_NAME#deploy:}"
     - IMAGE_NAME="${CI_REGISTRY_IMAGE}/${IMAGE}:latest"
     - cd "$IMAGE"
     - echo "Building image '${IMAGE}' as '${IMAGE_NAME}'"
-    - docker build -t "$IMAGE_NAME" .
-    - docker push     "$IMAGE_NAME"
+    - buildah build --squash -t "${IMAGE_NAME}" .
+    - buildah push "${IMAGE_NAME}"
 .create-local-copy: &copy-job
-  <<: *docker_template
   stage: deploy
+  image: $CI_REGISTRY/ict/images/buildah:v1
   script:
     - IMAGE="${CI_JOB_NAME#copy:}"
-    - docker pull "${IMAGE}"
-    - docker tag "${IMAGE}" "${CI_REGISTRY_IMAGE}/${IMAGE}"
-    - docker push "${CI_REGISTRY_IMAGE}/${IMAGE}"
+    - buildah pull "${IMAGE}"
+    - buildah tag "${IMAGE}" "${CI_REGISTRY_IMAGE}/${IMAGE}"
+    - buildah push "${CI_REGISTRY_IMAGE}/${IMAGE}"
 deploy:alt-builder:
   <<: *push-only-job