Dockerize SSO Manager (all-in-one image) + GitHub Pages docs

All-in-one Dockerfile.openldap bundling the app + OpenLDAP + Redis in one
container, plus an idempotent bare-metal install.sh, and a Jekyll docs site
for GitHub Pages:
- Dockerfile.openldap (node:20-alpine; openldap + pw-sha2/ppolicy/memberof/
  refint; dumb-init PID 1; npm ci --omit=dev; tos.md copied to /).
- docker-entrypoint.sh: generate slapd.conf (mdb + overlays + TLS + indexes +
  access), self-signed LDAPS cert, seed directory tree + required groups,
  bundled redis, export app_* config, exec node.
- docker-compose.yml, .dockerignore, DEPLOYMENT.md, secrets.js.example.
- install.sh: idempotent Debian/Ubuntu bare-metal installer (Node 20.x,
  OpenLDAP, Redis, systemd unit) with flags + --dry-run/--skip-ldap/--skip-app.
- ops/ldif/: memberof/refint/tls/index/nodes/logging LDIFs.
- nodejs/conf/base.js: generic defaults (dc=example,dc=com / localhost /
  SSO Manager) so per-deployment values move to secrets.js or app_* env.
- nodejs/package.json: bump @simpleworkjs/conf to ^1.1.0 (app_* env overrides).
- nodejs/routes/index.js: /health endpoint for healthchecks.
- docs/: _config.yml + index/deployment/configuration/oauth/ldap pages
  (jekyll-theme-cayman) for GitHub Pages from /docs.

Co-Authored-By: Claude <noreply@anthropic.com>

docs/configuration.md

@@ -0,0 +1,99 @@
+---
+layout: default
+title: Configuration
+---
+
+# Configuration
+
+[← Back to Home](index.html)
+
+The app loads configuration via
+[`@simpleworkjs/conf`](https://www.npmjs.com/package/@simpleworkjs/conf), which
+deep-merges, in order (later wins):
+
+1. `conf/base.js` — committed, generic defaults (`dc=example,dc=com`,
+   `localhost`, `SSO Manager`).
+2. `conf/<NODE_ENV>.js` — optional, environment-specific.
+3. `conf/secrets.js` — gitignored; secrets + per-deployment values.
+4. **`app_*` environment variables** — the highest-precedence layer.
+
+Any env var whose name starts with `app_` overrides the merged config. The rest
+of the name splits on **double-underscore** (`__`) into a nested path. Values are
+`JSON.parse`-coerced when possible (numbers, booleans, null, JSON) and kept as
+raw strings otherwise.
+
+## Examples
+
+| Env var | Sets | Type |
+|---------|------|------|
+| `app_ldap__url=ldap://host:389` | `conf.ldap.url` | string |
+| `app_ldap__bindPassword=secret` | `conf.ldap.bindPassword` | string |
+| `app_ldap__userBase=ou=people,dc=…` | `conf.ldap.userBase` | string |
+| `app_oauth__jwtSecret=...` | `conf.oauth.jwtSecret` | string |
+| `app_oauth__issuer=https://sso.example.com` | `conf.oauth.issuer` | string |
+| `app_oauth__token_lifetime__access_token=3600` | `conf.oauth.token_lifetime.access_token` | number |
+| `app_smtp__secure=false` | `conf.smtp.secure` | boolean |
+| `app_smtp__host=smtp.example.com` | `conf.smtp.host` | string |
+| `app_name=My SSO` | `conf.name` | string |
+| `app_redis__host=redis.local` | `conf.redis.host` | string (external Redis) |
+
+## The `app_*` env layer requires conf >= 1.1.0
+
+The `app_*` environment-variable override layer was added in
+`@simpleworkjs/conf` **1.1.0**. On 1.0.0 the app ignores all `app_*` vars and only
+reads `base.js` / `<NODE_ENV>.js` / `secrets.js`. The Docker image will not honor
+`app_*` env on 1.0.0. Refresh the lock from the `nodejs/` directory:
+
+```bash
+cd nodejs && npm install @simpleworkjs/conf@^1.1.0
+```
+
+## Inspecting the merged config
+
+From the `nodejs/` directory:
+
+```bash
+node -e "console.log(require('@simpleworkjs/conf').ldap)"
+node -e "console.log(require('@simpleworkjs/conf').oauth)"
+node -e "console.log(require('@simpleworkjs/conf'))"   # everything
+```
+
+Or, inside the running container:
+
+```bash
+docker compose exec sso-manager node -e "console.log(require('@simpleworkjs/conf').ldap)"
+```
+
+`app_*` env vars override `secrets.js`, which overrides `base.js` — if a value
+isn't what you expect, check those layers in that order.
+
+## Migrating an existing instance to the generic defaults
+
+The committed `nodejs/conf/base.js` ships **generic** defaults
+(`dc=example,dc=com`, `localhost`, `SSO Manager`). Previously it carried
+Theta42-specific values (LDAP bind DN/bases, SMTP host/user/sender, OAuth
+issuer). If you run an existing instance off this repo:
+
+- Move per-deployment, non-secret values (bind DN, user/group bases, SMTP
+  host/user/sender, OAuth issuer, org name) from `base.js` into your gitignored
+  `conf/secrets.js`, **or** set them as `app_*` env vars.
+- Secret values (LDAP bind password, SMTP password, JWT secret) already belong
+  in `secrets.js`.
+
+## Troubleshooting `app_*` env vars
+
+### `app_*` vars seem to do nothing
+
+You're on `@simpleworkjs/conf` 1.0.0. Bump to 1.1.0+ (above).
+
+### LDAP operations 401 / "Invalid Credentials"
+
+Check the merged LDAP config the app actually sees:
+
+```bash
+cd nodejs && node -e "console.log(require('@simpleworkjs/conf').ldap)"
+```
+
+Confirm `url` / `bindDN` / `bindPassword` / `userBase` match your directory.
+
+[← Back to Home](index.html)