2026-06-11 15:59:39 +01:00
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# Why is the DLR shut today?
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A single-page site that displays one randomly chosen message in the centre of
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the screen. The message changes on every page load and whenever the
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**Check again** button is pressed.
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The site is themed around the Docklands Light Railway colour scheme, with a
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toggle between:
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- **Modern colours** — the current DLR turquoise/teal branding.
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- **Original colours** — the 1987 DLR red-and-blue livery.
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The chosen theme is remembered between visits via `localStorage`.
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## Adding messages
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Edit `messages.js` and fill the `MESSAGES` array with your own reasons — one
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string per entry. Entries are inserted as plain text. Until you add some, the
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page shows a fallback prompt.
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## Running
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It is a static site with no build step. Open `index.html` in a browser, or
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serve the directory with any static file server, for example:
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```sh
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python3 -m http.server
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```
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2026-06-11 16:07:10 +01:00
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## Container
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The site is packaged as a container based on `nginxinc/nginx-unprivileged`. It
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runs as a non-root user and listens on port **8080**, serving the static files
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and exposing a `/healthz` endpoint. It is designed to sit behind an external
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reverse proxy that terminates TLS and routes by host.
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Build and run locally:
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```sh
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docker build -t dlr .
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docker run --rm -p 8080:8080 dlr
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# then browse http://localhost:8080
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```
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## CI
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`.gitea/workflows/build-and-publish.yml` builds the container with Gitea Actions
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and publishes it to this Gitea instance's container registry on pushes to `main`
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and on `v*` tags. Pull requests build the image but do not push. Authentication
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uses the automatically provided `GITEA_TOKEN`; the registry host is derived from
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the Gitea server URL.
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The published image is `<gitea-host>/<owner>/<repo>`, tagged by branch, semver
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(for `v*` tags), commit SHA, and `latest` on the default branch.
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## Dependency updates
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`renovate.json` configures Renovate to keep dependencies current:
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- the Dockerfile base image,
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- the actions used in the Gitea workflow,
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- versioned front-end dependencies referenced in HTML.
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There are currently no external front-end dependencies. When one is added via a
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CDN, Renovate will track it if it is either annotated with a comment, e.g.
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```html
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<!-- renovate: datasource=npm depName=bootstrap -->
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<link href="https://cdn.example.com/bootstrap@5.3.3/dist/css/bootstrap.min.css" rel="stylesheet">
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```
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or referenced through a versioned jsDelivr / unpkg npm URL, which is detected
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automatically.
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2026-06-11 15:59:39 +01:00
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## Files
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2026-06-11 16:07:10 +01:00
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| File | Purpose |
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| ------------------------------------- | ------------------------------------------------ |
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| `index.html` | Page structure. |
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| `styles.css` | Both colour schemes, selected via `data-theme`. |
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| `messages.js` | The list of messages (fill this in). |
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| `script.js` | Random message selection and the theme toggle. |
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| `Dockerfile` / `default.conf` | Container image and nginx static-serving config. |
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| `.gitea/workflows/` | Gitea Actions build-and-publish pipeline. |
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| `renovate.json` | Renovate dependency-update configuration. |
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