feat: add debian packaging, CI/CD and update script

- Add debian/ packaging for .deb generation
- Add .forgejo/workflows/build.yml for CI/CD (runner label: docker)
- Add scripts/fullupdater and scripts/fullupdater-update
- Remove obsolete install.sh
- Update .gitignore for debian build artifacts

scripts/fullupdater-update

@@ -0,0 +1,71 @@
+#!/bin/bash
+set -e
+
+REPO_URL="https://git.geronzi.fr"
+OWNER="geronzi"
+REPO="full_updater"
+TOKEN_FILE="/etc/full-updater/token"
+CONFIG_FILE="/etc/full-updater/config.ini"
+INSTALLED_VERSION=$(dpkg -s full-updater 2>/dev/null | grep "^Version:" | awk '{print $2}' || echo "0.0.0")
+
+echo "=== Full Updater Update ==="
+echo "Version installée : ${INSTALLED_VERSION}"
+
+# Build API headers
+HEADERS=(-H "Content-Type: application/json")
+if [ -f "$TOKEN_FILE" ]; then
+    TOKEN=$(cat "$TOKEN_FILE" | tr -d '[:space:]')
+    HEADERS+=("-H" "Authorization: token ${TOKEN}")
+fi
+
+# Fetch latest release
+API_URL="${REPO_URL}/api/v1/repos/${OWNER}/${REPO}/releases/latest"
+echo "Recherche de la dernière release..."
+
+RESPONSE=$(curl -s -L "${HEADERS[@]}" "$API_URL")
+if [ -z "$RESPONSE" ] || echo "$RESPONSE" | grep -q "Not Found"; then
+    echo "Erreur : impossible de récupérer la dernière release."
+    echo "Vérifiez l'URL : $API_URL"
+    echo "Pour un repo privé, créez /etc/full-updater/token avec un token d'accès Forgejo."
+    exit 1
+fi
+
+LATEST_TAG=$(echo "$RESPONSE" | python3 -c "import sys,json; d=json.load(sys.stdin); print(d.get('tag_name',''))")
+if [ -z "$LATEST_TAG" ]; then
+    echo "Erreur : aucune release trouvée."
+    exit 1
+fi
+
+LATEST_VERSION=${LATEST_TAG#v}
+echo "Dernière version    : ${LATEST_VERSION}"
+
+if [ "$INSTALLED_VERSION" = "$LATEST_VERSION" ]; then
+    echo "✅ Full Updater est déjà à jour (${INSTALLED_VERSION})."
+    exit 0
+fi
+
+# Find .deb asset
+ASSET_URL=$(echo "$RESPONSE" | python3 -c "
+import sys, json
+d = json.load(sys.stdin)
+for a in d.get('assets', []):
+    if a['name'].endswith('.deb'):
+        print(a['browser_download_url'])
+        break
+")
+
+if [ -z "$ASSET_URL" ]; then
+    echo "Erreur : aucun fichier .deb trouvé dans la release ${LATEST_TAG}."
+    exit 1
+fi
+
+TMP_DEB="/tmp/full-updater-${LATEST_VERSION}.deb"
+echo "Téléchargement de ${ASSET_URL}..."
+curl -s -L -o "$TMP_DEB" "${HEADERS[@]}" "$ASSET_URL"
+
+echo "Installation..."
+dpkg -i "$TMP_DEB"
+apt-get install -f -y
+rm -f "$TMP_DEB"
+
+echo "✅ Mise à jour terminée : ${INSTALLED_VERSION} → ${LATEST_VERSION}"