docs: runner installation guide for all 8 HomeLab servers + automation script

- New doc: DevOps/Installation Gitea Runners — Tous les Serveurs.md
  - Step-by-step for each server: deepin-desktop, dev.lab, dev.prod,
    docker.test, automate.prod, media-1.lab, openclaw1.dev, automate.dev
  - Alpine vs Debian/Ubuntu instructions (OpenRC vs systemd)
  - Labels reference table for all 8 servers
  - Automated install script + usage examples
- New script: scripts/install-gitea-runner.sh
  - Universal installer: auto-detects OS (Alpine/Debian/Arch)
  - Installs Docker if missing, downloads runner, registers, sets up service
  - Supports x86_64, ARM64, ARMv7 architectures

scripts/install-gitea-runner.sh

@@ -0,0 +1,142 @@
+#!/bin/bash
+# ================================================================
+#  install-gitea-runner.sh
+#  Installation automatisée d'un runner Gitea Actions
+#
+#  Usage:
+#    ./install-gitea-runner.sh <TOKEN> <NAME> <LABELS>
+#
+#  Exemple:
+#    ./install-gitea-runner.sh abc123 "dev-lab" "self-hosted,lab,docker,obsigate"
+# ================================================================
+set -e
+
+TOKEN="$1"
+NAME="$2"
+LABELS="$3"
+
+if [ -z "$TOKEN" ] || [ -z "$NAME" ] || [ -z "$LABELS" ]; then
+    echo "❌ Usage: ./install-gitea-runner.sh <TOKEN> <NAME> <LABELS>"
+    echo "   Example: ./install-gitea-runner.sh abc123 dev-lab 'self-hosted,lab,docker,obsigate'"
+    exit 1
+fi
+
+echo "============================================="
+echo "  Gitea Runner Installer"
+echo "  Server : $NAME"
+echo "  Labels : $LABELS"
+echo "============================================="
+echo ""
+
+# ── 1. Detect OS ─────────────────────────────────────────────────
+if [ -f /etc/alpine-release ]; then
+    OS="alpine"
+elif [ -f /etc/debian_version ]; then
+    OS="debian"
+elif [ -f /etc/arch-release ]; then
+    OS="arch"
+else
+    echo "⚠️  Unknown OS — assuming Debian-based"
+    OS="debian"
+fi
+echo "🖥️  Detected OS: $OS"
+
+# ── 2. Ensure Docker ─────────────────────────────────────────────
+echo "[1/4] Checking Docker..."
+if ! command -v docker &>/dev/null; then
+    echo "   Installing Docker..."
+    if [ "$OS" = "alpine" ]; then
+        apk add --no-cache docker curl
+        rc-update add docker boot
+        service docker start
+    elif [ "$OS" = "debian" ]; then
+        sudo apt-get update -qq
+        sudo apt-get install -y -qq docker.io curl
+        sudo usermod -aG docker "$USER"
+    elif [ "$OS" = "arch" ]; then
+        sudo pacman -S --noconfirm docker curl
+        sudo systemctl enable --now docker
+        sudo usermod -aG docker "$USER"
+    fi
+fi
+echo "   ✅ Docker OK"
+
+# ── 3. Download & install runner ──────────────────────────────────
+echo "[2/4] Downloading Gitea act_runner..."
+ARCH=$(uname -m)
+case "$ARCH" in
+    x86_64)  RUNNER_ARCH="amd64" ;;
+    aarch64) RUNNER_ARCH="arm64" ;;
+    armv7l)  RUNNER_ARCH="armv7" ;;
+    *)       echo "❌ Unsupported architecture: $ARCH"; exit 1 ;;
+esac
+
+RUNNER_URL="https://dl.gitea.com/act_runner/act_runner-linux-${RUNNER_ARCH}"
+sudo curl -sL -o /usr/local/bin/act_runner "$RUNNER_URL"
+sudo chmod +x /usr/local/bin/act_runner
+echo "   ✅ act_runner installed ($(/usr/local/bin/act_runner --version 2>&1 | head -1))"
+
+# ── 4. Register ───────────────────────────────────────────────────
+echo "[3/4] Registering runner with Gitea..."
+/usr/local/bin/act_runner register \
+    --instance https://git.dracodev.net \
+    --token "$TOKEN" \
+    --name "$NAME" \
+    --labels "$LABELS" \
+    --no-interactive
+echo "   ✅ Runner registered"
+
+# ── 5. Install as service ────────────────────────────────────────
+echo "[4/4] Installing as system service..."
+
+if [ "$OS" = "alpine" ]; then
+    # Alpine OpenRC
+    sudo tee /etc/init.d/gitea-runner > /dev/null <<EOF
+#!/sbin/openrc-run
+name="Gitea Actions Runner ($NAME)"
+command="/usr/local/bin/act_runner"
+command_args="daemon"
+command_background=true
+pidfile="/run/\${RC_SVCNAME}.pid"
+output_log="/var/log/gitea-runner.log"
+error_log="/var/log/gitea-runner.log"
+EOF
+    sudo chmod +x /etc/init.d/gitea-runner
+    sudo rc-update add gitea-runner default
+    sudo service gitea-runner start
+else
+    # Systemd (Debian, Arch)
+    sudo tee /etc/systemd/system/gitea-runner.service > /dev/null <<EOF
+[Unit]
+Description=Gitea Actions Runner ($NAME)
+After=network.target docker.service
+Requires=docker.service
+
+[Service]
+ExecStart=/usr/local/bin/act_runner daemon
+Restart=always
+RestartSec=5
+
+[Install]
+WantedBy=multi-user.target
+EOF
+    sudo systemctl daemon-reload
+    sudo systemctl enable --now gitea-runner
+fi
+echo "   ✅ Service installed and started"
+
+# ── 6. Verify ─────────────────────────────────────────────────────
+echo ""
+sleep 2
+if [ "$OS" = "alpine" ]; then
+    sudo service gitea-runner status 2>&1 | head -3
+else
+    sudo systemctl status gitea-runner --no-pager -l 2>&1 | head -5
+fi
+
+echo ""
+echo "============================================="
+echo "  ✅ Runner '$NAME' installed successfully!"
+echo "  Labels : $LABELS"
+echo "  Vérifier dans Gitea → Admin → Runners"
+echo "============================================="