Add VPS step-1 installer for Rubix releases

- install-rubix.sh: apt update/upgrade, token prompt, download rubix zip into /home/www/callcenter
- Document clone/raw URLs for rubix-deploy; ignore downloaded zip artifacts

.gitignore

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+*.zip
+release.json
+rubix.zip

README.md

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+# rubix-deploy
+
+Bootstrap **step 1** for new Rubix servers (install app from Gitea release).
+
+**Repository:** https://gitea.dialer.work/swissdatabase/rubix-deploy  
+**Clone:** `git clone https://gitea.dialer.work/swissdatabase/rubix-deploy.git`
+
+## On a new VPS
+
+```bash
+wget -O install-rubix.sh \
+  https://gitea.dialer.work/swissdatabase/rubix-deploy/raw/branch/main/install-rubix.sh
+chmod +x install-rubix.sh
+sudo ./install-rubix.sh
+```
+
+If the repo is **Internal** (not Public), use a token to fetch the script:
+
+```bash
+wget --header="Authorization: token <GITEA_TOKEN>" -O install-rubix.sh \
+  https://gitea.dialer.work/swissdatabase/rubix-deploy/raw/branch/main/install-rubix.sh
+```
+
+The script: `apt update` + `apt upgrade`, installs tools, asks for token, creates `/home/www/callcenter`, downloads **rubix**.
+
+**Step 2+** (`.env`, Docker, `up.sh`): [swissdatabase/rubix](https://gitea.dialer.work/swissdatabase/rubix) README.

install-rubix.sh

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+#!/bin/bash
+# Step 1 on a new VPS: apt update/upgrade, token prompt, /home/www/callcenter, download rubix release.
+#
+# Publish: https://gitea.dialer.work/swissdatabase/rubix-deploy
+# Clone:   https://gitea.dialer.work/swissdatabase/rubix-deploy.git
+#
+# On the VPS:
+#   wget -O install-rubix.sh \
+#     https://gitea.dialer.work/swissdatabase/rubix-deploy/raw/branch/main/install-rubix.sh
+#   chmod +x install-rubix.sh
+#   sudo ./install-rubix.sh
+
+set -euo pipefail
+
+RUBIX_DEPLOY_REPO="https://gitea.dialer.work/swissdatabase/rubix-deploy"
+RUBIX_DEPLOY_RAW="${RUBIX_DEPLOY_REPO}/raw/branch/main/install-rubix.sh"
+
+GITEA_HOST="${GITEA_HOST:-gitea.dialer.work}"
+GITEA_OWNER="${GITEA_OWNER:-swissdatabase}"
+GITEA_REPO="${GITEA_REPO:-rubix}"
+RUBIX_INSTALL_PATH="${RUBIX_INSTALL_PATH:-/home/www/callcenter}"
+GITEA_TOKEN="${GITEA_TOKEN:-${GITEA_REGISTRY_PULL_TOKEN:-}}"
+
+TAG="${1:-}"
+
+APT_PACKAGES=(unzip wget curl python3 ca-certificates git rsync)
+
+prepare_system() {
+  if [[ "$(id -u)" -ne 0 ]]; then
+    echo "Run with sudo: sudo ./install-rubix.sh" >&2
+    exit 1
+  fi
+  if ! command -v apt-get >/dev/null 2>&1; then
+    echo "apt-get not found — install ${APT_PACKAGES[*]} manually." >&2
+    exit 1
+  fi
+  export DEBIAN_FRONTEND=noninteractive
+  echo "[install-rubix] apt-get update ..."
+  apt-get update -y
+  if [[ "${SKIP_APT_UPGRADE:-}" != "1" ]]; then
+    echo "[install-rubix] apt-get upgrade ..."
+    apt-get upgrade -y
+  fi
+  echo "[install-rubix] apt-get install ${APT_PACKAGES[*]} ..."
+  apt-get install -y "${APT_PACKAGES[@]}"
+}
+
+prompt_token() {
+  if [[ -n "${GITEA_TOKEN}" ]]; then
+    return 0
+  fi
+  echo "Gitea token (private rubix repo — same as registry / GITEA_REGISTRY_PULL_TOKEN):"
+  read -r -s GITEA_TOKEN
+  echo ""
+  if [[ -z "${GITEA_TOKEN}" ]]; then
+    echo "Token is required." >&2
+    exit 1
+  fi
+}
+
+prepare_system
+prompt_token
+
+echo "[install-rubix] install path: ${RUBIX_INSTALL_PATH}"
+mkdir -p "${RUBIX_INSTALL_PATH}"
+cd "${RUBIX_INSTALL_PATH}"
+
+if [[ -z "${TAG}" ]]; then
+  echo "[install-rubix] fetching latest release tag ..."
+  wget -q --header="Authorization: token ${GITEA_TOKEN}" \
+    -O /tmp/rubix-release.json \
+    "https://${GITEA_HOST}/api/v1/repos/${GITEA_OWNER}/${GITEA_REPO}/releases/latest"
+  TAG="$(python3 -c 'import json; print(json.load(open("/tmp/rubix-release.json"))["tag_name"])')"
+  rm -f /tmp/rubix-release.json
+fi
+
+ZIP_URL="https://${GITEA_HOST}/${GITEA_OWNER}/${GITEA_REPO}/archive/${TAG}.zip"
+echo "[install-rubix] downloading ${TAG} ..."
+
+wget --header="Authorization: token ${GITEA_TOKEN}" -O rubix.zip "${ZIP_URL}"
+unzip -oq rubix.zip
+
+TOP="$(find . -maxdepth 1 -type d ! -name '.' | head -1)"
+if [[ -n "${TOP}" ]]; then
+  echo "[install-rubix] flatten ${TOP}/ into ${RUBIX_INSTALL_PATH}"
+  shopt -s dotglob
+  mv "${TOP}"/* .
+  rmdir "${TOP}"
+  shopt -u dotglob
+fi
+
+rm -f rubix.zip
+echo ""
+echo "[install-rubix] done — ${RUBIX_INSTALL_PATH} (${TAG})"
+echo "[install-rubix] next (see rubix README step 2):"
+echo "  cd ${RUBIX_INSTALL_PATH}/deploy/docker"
+echo "  cp .env.example .env"
+echo "  nano .env"
+echo "  sudo ./up.sh"