Add Ubuntu packaging script (#2936)

.CI/CreateUbuntuDeb.sh

@@ -0,0 +1,35 @@
+#!/bin/sh
+set -e
+
+if [ ! -f ./bin/chatterino ] || [ ! -x ./bin/chatterino ]; then
+    echo "ERROR: No chatterino binary file found. This script must be run in the build folder, and chatterino must be built first."
+    exit 1
+fi
+
+chatterino_version=$(git describe | cut -c 2-)
+echo "Found Chatterino version $chatterino_version via git"
+
+rm -vrf "./package" || true  # delete any old packaging dir
+
+# create ./package/ from scratch
+mkdir package/DEBIAN -p
+packaging_dir="$(realpath ./package)"
+
+echo "Making control file"
+cat >> "$packaging_dir/DEBIAN/control" << EOF
+Package: chatterino
+Section: net
+Priority: optional
+Architecture: amd64
+Maintainer: Mm2PL <mm2pl@kotmisia.pl>
+Description: Testing out chatterino as a Ubuntu package
+Depends: libc6, libqt5concurrent5, libqt5core5a, libqt5dbus5, libqt5gui5, libqt5multimedia5, libqt5network5, libqt5svg5, libqt5widgets5, libssl1.1, libstdc++6
+EOF
+echo "Version: $chatterino_version" >> "$packaging_dir/DEBIAN/control"
+
+echo "Running make install in package dir"
+DESTDIR="$packaging_dir" make INSTALL_ROOT="$packaging_dir" -j"$(nproc)" install; find "$packaging_dir/"
+echo ""
+
+echo "Building package..."
+dpkg-deb --build "$packaging_dir" "Chatterino.deb"