Added gitlab-ci to build docker image

.gitlab-ci.yml

@@ -0,0 +1,13 @@
+stages:
+  - test
+  - build
+
+# This folder is cached between builds
+# http://docs.gitlab.com/ce/ci/yaml/README.html#cache
+cache:
+  key: ${CI_COMMIT_REF_SLUG}
+  paths:
+    - vendor/
+
+include:
+  - .gitlab-docker-x86_64.yml

.gitlab-docker-x86_64.yml

@@ -0,0 +1,32 @@
+docker:
+  image: docker:latest
+
+  stage: build
+
+  services:
+    - docker:dind
+
+  variables:
+    VERSION: latest
+    CACHETAG: build-${VERSION}
+    DOCKER_HOST: tcp://docker:2375
+
+  tags:
+    - docker
+    - x86_64
+  only:
+    - master
+
+  before_script:
+    - docker info
+    - docker version
+    - echo "$CI_JOB_TOKEN" | docker login -u "$CI_REGISTRY_USER" "$CI_REGISTRY" --password-stdin
+    - if [ -n "$GITHUB_TOKEN" ]; then cat $GITHUB_TOKEN |base64 -d > auth.json; fi
+
+  script:
+    - if [ -f init ]; then chmod 500 init; fi
+    - ([ -z "$REFRESH" ] && docker pull ${CI_REGISTRY_IMAGE}:${CACHETAG}) || echo "true"
+    - echo -n ${CI_COMMIT_SHORT_SHA} > VERSION
+    - docker build --cache-from ${CI_REGISTRY_IMAGE}:${CACHETAG} -t ${CI_REGISTRY_IMAGE}:${VERSION} -t ${CI_REGISTRY_IMAGE}:${CACHETAG} .
+    - docker push ${CI_REGISTRY_IMAGE}:${VERSION}
+    - docker push ${CI_REGISTRY_IMAGE}:${CACHETAG}

Dockerfile

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+FROM registry.leenooks.net/leenooks/php:8.0-fpm-mp
+
+COPY . /var/www/html/
+
+RUN mkdir /var/www/.composer \
+	&& ([ -r auth.json ] && mv auth.json /var/www/.composer/) || true \
+	&& touch .composer.refresh \
+	&& mv .env.example .env \
+	&& FORCE_PERMS=1 /sbin/init \
+	&& rm -rf /var/www/.composer/*