Update the AppImage docker to Ubuntu 20.04

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "papercraft"
-version = "2.5.0"
+version = "2.6.0"
 authors = ["Rodrigo Rivas Costa <rodrigorivascosta@gmail.com>"]
 edition = "2021"
 license = "GPL-3.0-or-later"

distro/docker/Dockerfile

@@ -1,11 +1,15 @@
-FROM ubuntu:18.04
+FROM ubuntu:20.04
 WORKDIR /app
+RUN ln -sf /usr/share/zoneinfo/Europe/Madrid /etc/localtime
 RUN apt -y update
 RUN apt -y upgrade
 RUN apt -y install curl gcc pkg-config xz-utils fuse libclang-dev file libfreetype6-dev
+RUN apt -y install g++
 RUN curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs > rustup.rs
 # Rust 1.76
 RUN sh rustup.rs -y --profile minimal -c rustfmt
+copy g++ /usr/local/bin/g++
+copy g++ /usr/local/bin/c++
 COPY linuxdeploy ./
 COPY makeappimage ./
 COPY apprun ./

distro/docker/g++

@@ -0,0 +1,12 @@
+#!/bin/bash
+argc=$#
+argv=("$@")
+
+for (( j=0; j<argc; j++ )); do
+    if [ "${argv[j]}" = "-std=c++20" ]
+    then
+        argv[j]="-std=c++2a"
+    fi
+done
+
+exec /usr/bin/g++ "${argv[@]}"

src/main.rs

@@ -534,7 +534,7 @@ impl GlobalContext {
                 center_url(ui, env!("CARGO_PKG_REPOSITORY"), "url", None, sz_full.x);
                 advance_cursor(ui, 0.0, 0.5);
                 ui.with_push(self.font_small, || {
-                    center_text(ui, "© Copyright 2022 - Rodrigo Rivas Costa", sz_full.x);
+                    center_text(ui, "© Copyright 2024 - Rodrigo Rivas Costa", sz_full.x);
                     center_text(
                         ui,
                         "This program comes with absolutely no warranty.",