First commit

.gitlab-ci.yaml

+image: docker:stable
+
+cache:
+  key: "$CI_BUILD_REF_NAME"
+
+stages:
+  - build
+  - test
+
+services:
+  - docker:dind
+
+before_script:
+  - echo $CI_JOB_TOKEN | docker login --username gitlab-ci-token --password-stdin $CI_REGISTRY
+
+build:
+  stage: build
+  script:
+    - docker pull $CI_REGISTRY_IMAGE || true
+    - docker build --cache-from $CI_REGISTRY_IMAGE --tag $CI_REGISTRY_IMAGE:latest --build-arg http_proxy=${http_proxy} --build-arg https_proxy=${http_proxy} .
+    - docker push $CI_REGISTRY_IMAGE
+
+test:
+  stage: test
+  image: $CI_REGISTRY_IMAGE
+  before_script: []
+  script:
+    - drawio --version

Dockerfile

+FROM fedora:31
+
+RUN dnf install -y xorg-x11-server-Xvfb alsa-lib dnf-plugins-core
+RUN dnf copr enable -y adrienverge/some-nice-fonts
+RUN dnf install -y some-nice-fonts
+RUN dnf install -y https://github.com/jgraph/drawio-desktop/releases/download/v12.6.5/draw.io-x86_64-12.6.5.rpm
+
+COPY ./drawio /usr/local/bin/drawio
\ No newline at end of file

drawio

+#!/bin/bash
+
+echo "Running drawio in CLI mode only using xvfb-run"
+
+xvfb-run /opt/draw.io/drawio --no-sandbox $@
\ No newline at end of file