GitLab Shared runner, deploy spring boot microservice app to custom server - spring-boot

Question

Before i start, let me tell you that i'm newbie to Gitlab CI file :)
i'm looking to automate deployments of spring boot microservice app to custom server (a namecheap VPS).
(I'm using the Gitlab shared runner)
i have used jHipster ci-cd to generate the .gitlab-ci.yml file. Doing that, i have: build, package, release stages working.
i even could see the image repository built in Gitlab Container registery.
What last, is the deployment. i know that i have to use a docker container to deploy it, but i don't know how.
I'm stuck in deploying the image repository to my VPS.
(as it's my first microservice, my VPS is still new, having only java installed).
Here is my .gitlab-ci.yml file:
#image: jhipster/jhipster:v6.9.0
image: openjdk:11-jdk
cache:
key: "$CI_COMMIT_REF_NAME"
paths:
- .maven/
stages:
- check
- build
# - test
# - analyze
- package
- release
- deploy
before_script:
- chmod +x mvnw
- git update-index --chmod=+x mvnw
- export NG_CLI_ANALYTICS="false"
- export MAVEN_USER_HOME=`pwd`/.maven
nohttp:
stage: check
script:
- ./mvnw -ntp checkstyle:check -Dmaven.repo.local=$MAVEN_USER_HOME
maven-compile:
stage: build
script:
- ./mvnw -ntp compile -P-webpack -Dmaven.repo.local=$MAVEN_USER_HOME
artifacts:
paths:
- target/classes/
- target/generated-sources/
expire_in: 1 day
#maven-test:
# stage: test
# script:
# - ./mvnw -ntp verify -P-webpack -Dmaven.repo.local=$MAVEN_USER_HOME
# artifacts:
# reports:
# junit: target/test-results/**/TEST-*.xml
# paths:
# - target/test-results
# - target/jacoco
# expire_in: 1 day
maven-package:
stage: package
script:
- ./mvnw -ntp verify -Pprod -DskipTests -Dmaven.repo.local=$MAVEN_USER_HOME
artifacts:
paths:
- target/*.jar
- target/classes
expire_in: 1 day
# Uncomment the following line to use gitlabs container registry. You need to adapt the REGISTRY_URL in case you are not using gitlab.com
docker-push:
stage: release
variables:
REGISTRY_URL: registry.gitlab.com
IMAGE_TAG: $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_SLUG-$CI_COMMIT_SHA
dependencies:
- maven-package
script:
- ./mvnw -ntp compile jib:build -Pprod -Djib.to.image=$IMAGE_TAG -Djib.to.auth.username=gitlab-ci-token -Djib.to.auth.password=$CI_BUILD_TOKEN -Dmaven.repo.local=$MAVEN_USER_HOME
docker-deploy:
image: docker:stable-git
stage: deploy
script:
when: manual
only:
- master
Thanks for your help :)