Initial commit for VuePress image creation automation

.gitlab-ci.yml

+test_build_image:
+  image: docker:git
+  tags:
+  - docker
+  services:
+  - docker:dind
+  script:
+    - docker build .
+  except:
+    - tags
+
+build_image:
+  image: docker:git
+  tags:
+  - docker
+  services:
+  - docker:dind
+  script:
+    - docker login -u "gitlab-ci-token" -p "$CI_BUILD_TOKEN" $CI_REGISTRY
+    - docker build --pull -t "$CI_REGISTRY_IMAGE:$CI_BUILD_TAG" .
+    - docker login -u "gitlab-ci-token" -p "$CI_BUILD_TOKEN" $CI_REGISTRY
+    - docker tag "$CI_REGISTRY_IMAGE:$CI_BUILD_TAG" "$CI_REGISTRY_IMAGE:$CI_BUILD_TAG"
+    - docker push "$CI_REGISTRY_IMAGE:$CI_BUILD_TAG"
+    - docker tag "$CI_REGISTRY_IMAGE:$CI_BUILD_TAG" "$CI_REGISTRY_IMAGE:latest"
+    - docker push "$CI_REGISTRY_IMAGE:latest"
+  only:
+    - tags

Dockerfile

+FROM node:16-bullseye-slim
+
+# Install VuePress
+RUN npm install -g vuepress

README.md

+## VuePress image
+
+The goal of this repository is to provide an image to build websites using [VuePress](https://www.npmjs.com/package/vuepress).
+There is currently [Silkaj website](https://git.duniter.org/websites/doc_silkaj) using it.
+
+The image is based on the [official Node.js images](https://hub.docker.com/_/node/?tab=description), based on Debian Bullseye Slim, with [VuePress](https://vuepress.vuejs.org/) on top.
+