Sync with GitHub (#68)

Co-authored-by: Jakob Silbereisen <[email protected]>

.gitlab-ci.yml

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+# To contribute improvements to CI/CD templates, please follow the Development guide at:
+# https://docs.gitlab.com/ee/development/cicd/templates.html
+# This specific template is located at:
+# https://gitlab.com/gitlab-org/gitlab/-/blob/master/lib/gitlab/ci/templates/Maven.gitlab-ci.yml
+
+# Build JAVA applications using Apache Maven (http://maven.apache.org)
+# For docker image tags see https://hub.docker.com/_/maven/
+#
+# For general lifecycle information see https://maven.apache.org/guides/introduction/introduction-to-the-lifecycle.html
+
+# This template will build and test your projects
+# * Caches downloaded dependencies and plugins between invocation.
+# * Verify but don't deploy merge requests.
+# * Deploy built artifacts from master branch only.
+
+variables:
+  # `showDateTime` will show the passed time in milliseconds. You need to specify `--batch-mode` to make this work.
+  MAVEN_OPTS: >-
+    -Dhttps.protocols=TLSv1.2
+    -Dmaven.repo.local=$CI_PROJECT_DIR/.m2/repository
+    -Dorg.slf4j.simpleLogger.showDateTime=true
+    -Djava.awt.headless=true
+
+  # As of Maven 3.3.0 instead of this you MAY define these options in `.mvn/maven.config` so the same config is used
+  # when running from the command line.
+  # As of Maven 3.6.1, the use of `--no-tranfer-progress` (or `-ntp`) suppresses download and upload messages. The use
+  # of the `Slf4jMavenTransferListener` is no longer necessary.
+  # `installAtEnd` and `deployAtEnd` are only effective with recent version of the corresponding plugins.
+  MAVEN_CLI_OPTS: >-
+    --batch-mode
+    --errors
+    --fail-at-end
+    --show-version
+    --no-transfer-progress
+    -DinstallAtEnd=true
+
+# This template uses the latest Maven 3 release, e.g., 3.8.6, and OpenJDK 8 (LTS)
+# for verifying and deploying images
+# Maven 3.8.x REQUIRES HTTPS repositories.
+# See https://maven.apache.org/docs/3.8.1/release-notes.html#how-to-fix-when-i-get-a-http-repository-blocked for more.
+image: maven:3.8.3-openjdk-17
+
+# Cache downloaded dependencies and plugins between builds.
+# To keep cache across branches add 'key: "$CI_JOB_NAME"'
+# Be aware that `mvn deploy` will install the built jar into this repository. If you notice your cache size
+# increasing, consider adding `-Dmaven.install.skip=true` to `MAVEN_OPTS` or in `.mvn/maven.config`
+cache:
+  paths:
+    - .m2/repository
+
+# For merge requests do not `deploy` but only run `verify`.
+# See https://maven.apache.org/guides/introduction/introduction-to-the-lifecycle.html
+.verify:
+  stage: test
+  script:
+    - 'mvn $MAVEN_CLI_OPTS verify'
+
+# Verify merge requests using JDK17
+verify:jdk17:
+  extends:
+    - .verify