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

debian/changelog

@@ -0,0 +1,5 @@
+full-updater (1.0.0) unstable; urgency=medium
+
+  * Initial release
+
+ -- Enzo <admin@geronzi.fr>  Mon, 01 Jan 2024 00:00:00 +0000

debian/control

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+Source: full-updater
+Section: admin
+Priority: optional
+Maintainer: Enzo <admin@geronzi.fr>
+Build-Depends: debhelper-compat (= 13), dh-python, python3-all, python3-venv
+Standards-Version: 4.6.0
+
+Package: full-updater
+Architecture: all
+Depends: ${python3:Depends}, python3-textual, python3-pyperclip, python3-venv, git, pct
+Description: TUI for APT/CVE updates on Proxmox host and LXC
+ Full Updater is a terminal user interface (TUI) that visualizes
+ available APT updates and CVEs for the Proxmox host and all LXC
+ containers. It supports keyboard and mouse controls, real-time
+ scanning, caching, and one-click upgrades via pct exec.

debian/postinst

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+#!/bin/bash
+set -e
+
+VENV_DIR="/opt/full-updater/.venv"
+OPT_DIR="/opt/full-updater"
+
+# Create venv and install deps
+if [ ! -d "$VENV_DIR" ]; then
+    python3 -m venv "$VENV_DIR"
+fi
+"$VENV_DIR/bin/pip" install --upgrade pip
+"$VENV_DIR/bin/pip" install -r "$OPT_DIR/requirements.txt"
+
+# Ensure symlinks
+ln -sf "$OPT_DIR/scripts/fullupdater" /usr/local/bin/fullupdater
+
+# Ensure cache dir exists
+mkdir -p /tmp/full-updater-cache
+
+# Upgrade existing install if deps changed
+"$VENV_DIR/bin/pip" install -r "$OPT_DIR/requirements.txt" --upgrade
+
+exit 0

debian/rules

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+#!/usr/bin/make -f
+
+export DH_VERBOSE = 1
+export PYBUILD_NAME = full-updater
+
+%:
+	dh $@ --with python3 --buildsystem=pybuild
+
+override_dh_auto_install:
+	dh_auto_install
+	install -D -m 755 scripts/fullupdater $(CURDIR)/debian/full-updater/opt/full-updater/scripts/fullupdater
+	install -D -m 755 scripts/fullupdater-update $(CURDIR)/debian/full-updater/usr/local/bin/fullupdater-update
+	install -D -m 644 requirements.txt $(CURDIR)/debian/full-updater/opt/full-updater/requirements.txt
+	cp -r full_updater $(CURDIR)/debian/full-updater/opt/full-updater/