Add docker image + ci job

.dockerignore

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+.git
+README.md
+Dockerfile
+

.woodpecker.yaml

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+steps:
+  - name: publish_image
+    image: woodpeckerci/plugin-docker-buildx
+    settings:
+      repo: git.gnous.eu/${CI_REPO_OWNER}/maintenance
+      dockerfile: Dockerfile
+      platforms: linux/amd64
+      registry: https://git.gnous.eu
+      tag: ${CI_COMMIT}
+      username:
+          from_secret: docker_username
+      password:
+        from_secret: docker_password
+    when:
+      branch: ${CI_REPO_DEFAULT_BRANCH}
+      event: push
+

Dockerfile

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+FROM ghcr.io/static-web-server/static-web-server:2.27
+COPY . /public