initial release

.gitlab-ci.yml

+image: docker:19.03.1
+
+stages:
+- build
+
+before_script:
+   - echo -n $CI_JOB_TOKEN | docker login -u gitlab-ci-token --password-stdin $CI_REGISTRY
+
+build:
+  stage: build
+  script:
+    - docker pull $CI_REGISTRY_IMAGE:latest || true
+    - docker build --cache-from $CI_REGISTRY_IMAGE:latest
+      --tag $CI_REGISTRY_IMAGE:$CI_COMMIT_SHA --tag $CI_REGISTRY_IMAGE:latest .
+    - docker push $CI_REGISTRY_IMAGE:$CI_COMMIT_SHA
+    - docker push $CI_REGISTRY_IMAGE:latest

Dockerfile

+FROM ubuntu:bionic
+
+RUN apt-get update \
+    && apt-get dist-upgrade -y \
+    && apt-get install -y ruby ruby-dev rubygems build-essential \
+    && gem install --no-document fpm \

README.md

+# ubuntufpm
+
+docker image for building packages with fpm, based on Ubuntu Bionic.