Add ability to deploy develop branch on k8s

[cakeinpanic]

Now each puch in develop branch triggers build & upload of docker image to Harbor allowing to deploy it in k8s infrastructure

[Copilot]

Pull request overview

Adds containerization and CI automation so that pushes to the develop branch build the Docusaurus site, package it into an nginx-based image (with basic auth), and push it to a Harbor registry for deployment in Kubernetes.

Changes:

• Introduces a multi-stage Dockerfile to build the static site and serve it via nginxinc/nginx-unprivileged with basic auth.
• Adds nginx + entrypoint script + docker-compose configuration for running the built site behind basic auth (including a /health endpoint).
• Adds a GitHub Actions workflow to build and push a develop image to Harbor; adds .env to .gitignore and provides .env.example.

Reviewed changes

Copilot reviewed 7 out of 8 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
Dockerfile	Multi-stage build (Node build → nginx runtime) for serving prebuilt static site.
docker/start.sh	Entry script that sources vault secrets (if present), generates htpasswd, and starts nginx.
docker/nginx.conf	Nginx vhost config with basic auth and a /health endpoint.
docker-compose.yml	Local compose definition to build and run the container with required env vars.
.gitignore	Adds .env to avoid committing local secrets.
.github/workflows/deploy-develop.yml	Builds and pushes develop image to Harbor on pushes to develop.
.env.example	Documents required basic-auth environment variables.
.dockerignore	Reduces Docker build context by excluding common build/cache directories.

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