feat: Move packaging scripts into dist/ and consolidate the service files

dist/debian/README.md

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+# Continuwuity for Debian
+
+This document provides information about downloading and deploying the Debian package. You can also use this guide for other `apt`-based distributions such as Ubuntu.
+
+### Installation
+
+See the [generic deployment guide](../deploying/generic.md) for additional information about using the Debian package.
+
+No `apt` repository is currently available. This feature is in development.
+
+### Configuration
+
+After installation, Continuwuity places the example configuration at `/etc/conduwuit/conduwuit.toml` as the default configuration file. The configuration file indicates which settings you must change before starting the service.
+
+You can customize additional settings by uncommenting and modifying the configuration options in `/etc/conduwuit/conduwuit.toml`.
+
+### Running
+
+The package uses the [`conduwuit.service`](../configuration/examples.md#example-systemd-unit-file) systemd unit file to start and stop Continuwuity. The binary installs at `/usr/sbin/conduwuit`.
+
+By default, this package assumes that Continuwuity runs behind a reverse proxy. The default configuration options apply (listening on `localhost` and TCP port `6167`). Matrix federation requires a valid domain name and TLS. To federate properly, you must set up TLS certificates and certificate renewal.
+
+For information about setting up a reverse proxy and TLS, consult online documentation and guides. The [generic deployment guide](../deploying/generic.md#setting-up-the-reverse-proxy) documents Caddy, which is the most user-friendly option for reverse proxy configuration.

dist/debian/config

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+#!/bin/sh
+set -e
+
+# TODO: implement debconf support that is maintainable without duplicating the config
+# Source debconf library.
+#. /usr/share/debconf/confmodule
+#
+## Ask for the Matrix homeserver name, address and port.
+#db_input high conduwuit/hostname || true
+#db_go
+#
+#db_input low conduwuit/address || true
+#db_go
+#
+#db_input medium conduwuit/port || true
+#db_go
+
+exit 0

dist/debian/postinst

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+#!/bin/sh
+set -e
+
+# TODO: implement debconf support that is maintainable without duplicating the config
+#. /usr/share/debconf/confmodule
+
+CONDUWUIT_DATABASE_PATH=/var/lib/conduwuit
+CONDUWUIT_CONFIG_PATH=/etc/conduwuit
+
+case "$1" in
+  configure)
+    # Create the `conduwuit` user if it does not exist yet.
+    if ! getent passwd conduwuit > /dev/null ; then
+      echo 'Adding system user for the conduwuit Matrix homeserver' 1>&2
+      adduser --system --group --quiet \
+        --home "$CONDUWUIT_DATABASE_PATH" \
+        --disabled-login \
+        --shell "/usr/sbin/nologin" \
+        conduwuit
+    fi
+
+    # Create the database path if it does not exist yet and fix up ownership
+    # and permissions for the config.
+    mkdir -v -p "$CONDUWUIT_DATABASE_PATH"
+
+    # symlink the previous location for compatibility if it does not exist yet.
+    if ! test -L "/var/lib/matrix-conduit" ; then
+        ln -s -v "$CONDUWUIT_DATABASE_PATH" "/var/lib/matrix-conduit"
+    fi
+
+    chown -v conduwuit:conduwuit -R "$CONDUWUIT_DATABASE_PATH"
+    chown -v conduwuit:conduwuit -R "$CONDUWUIT_CONFIG_PATH"
+
+    chmod -v 740 "$CONDUWUIT_DATABASE_PATH"
+
+    echo ''
+    echo 'Make sure you edit the example config at /etc/conduwuit/conduwuit.toml before starting!'
+    echo 'To start the server, run: systemctl start conduwuit.service'
+    echo ''
+
+    ;;
+esac
+
+#DEBHELPER#

dist/debian/postrm

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+#!/bin/sh
+set -e
+
+#. /usr/share/debconf/confmodule
+
+CONDUWUIT_CONFIG_PATH=/etc/conduwuit
+CONDUWUIT_DATABASE_PATH=/var/lib/conduwuit
+CONDUWUIT_DATABASE_PATH_SYMLINK=/var/lib/matrix-conduit
+
+case $1 in
+  purge)
+    # Remove debconf changes from the db
+    #db_purge
+
+    # Per https://www.debian.org/doc/debian-policy/ch-files.html#behavior
+    # "configuration files must be preserved when the package is removed, and
+    #  only deleted when the package is purged."
+
+    #
+
+    if [ -d "$CONDUWUIT_CONFIG_PATH" ]; then
+      if test -L "$CONDUWUIT_CONFIG_PATH"; then
+        echo "Deleting conduwuit configuration files"
+        rm -v -r "$CONDUWUIT_CONFIG_PATH"
+      fi
+    fi
+
+    if [ -d "$CONDUWUIT_DATABASE_PATH" ]; then
+      if test -L "$CONDUWUIT_DATABASE_PATH"; then
+        echo "Deleting conduwuit database directory"
+        rm -r "$CONDUWUIT_DATABASE_PATH"
+      fi
+    fi
+
+    if [ -d "$CONDUWUIT_DATABASE_PATH_SYMLINK" ]; then
+      if test -L "$CONDUWUIT_DATABASE_SYMLINK"; then
+        echo "Removing matrix-conduit symlink"
+        rm -r "$CONDUWUIT_DATABASE_PATH_SYMLINK"
+      fi
+    fi
+    ;;
+esac
+
+#DEBHELPER#