Create AppImage compilation script

.github/workflows/appimage.yaml

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+# Copyright 2024 the Cartero authors
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+#
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+on:
+  pull_request:
+    branches:
+      - trunk
+name: AppImage
+jobs:
+  stable:
+    name: Build (default profile)
+    runs-on: ubuntu-24.04
+    steps:
+    - name: Install dependencies
+      run: sudo apt update && sudo apt install -y --no-install-recommends gettext meson libgtk-4-dev libadwaita-1-dev libgtksourceview-5-dev desktop-file-utils xvfb
+    - uses: actions/checkout@v4
+    - name: Build
+      run: build-aux/appimage-build.sh stable
+  devel:
+    name: Build (development profile)
+    runs-on: ubuntu-24.04
+    steps:
+    - name: Install dependencies
+      run: sudo apt update && sudo apt install -y --no-install-recommends gettext meson libgtk-4-dev libadwaita-1-dev libgtksourceview-5-dev desktop-file-utils xvfb
+    - uses: actions/checkout@v4
+    - name: Build
+      run: build-aux/appimage-build.sh stable

build-aux/appimage-build.sh

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+#!/bin/bash
+
+set -e
+cd "$(dirname "$0")/.."
+
+case "$1" in
+  devel)
+    MESON_FLAGS="-Dprofile=development"
+    ICON_PATH="AppDir/usr/share/icons/hicolor/scalable/apps/es.danirod.Cartero.Devel.svg"
+    DESKTOP_PATH="AppDir/usr/share/applications/es.danirod.Cartero.Devel.desktop"
+    ;;
+  stable)
+    MESON_FLAGS="-Dprofile=default"
+    ICON_PATH="AppDir/usr/share/icons/hicolor/scalable/apps/es.danirod.Cartero.svg"
+    DESKTOP_PATH="AppDir/usr/share/applications/es.danirod.Cartero.desktop"
+    ;;
+  *)
+    echo "Usage: $0 [devel / stable]"
+    exit 1
+    ;;
+esac
+
+meson setup build --prefix="/" $MESON_FLAGS
+ninja -C build
+DESTDIR=$PWD/build/appimagetool/AppDir/usr ninja -C build install
+
+cd build/appimagetool
+[ -x appimagetool-x86_64.AppImage ] || curl -OL https://github.com/AppImage/AppImageKit/releases/download/continuous/appimagetool-x86_64.AppImage
+[ -x linuxdeploy-x86_64.AppImage ] || curl -OL https://github.com/linuxdeploy/linuxdeploy/releases/download/continuous/linuxdeploy-x86_64.AppImage
+[ -x linuxdeploy-plugin-gtk.sh ] || curl -OL https://raw.githubusercontent.com/linuxdeploy/linuxdeploy-plugin-gtk/master/linuxdeploy-plugin-gtk.sh
+chmod +x appimagetool-x86_64.AppImage linuxdeploy-x86_64.AppImage linuxdeploy-plugin-gtk.sh
+
+DEPLOY_GTK_VERSION=4
+
+export DEPLOY_GTK_VERSION
+
+# First iteration
+./linuxdeploy-x86_64.AppImage --appdir AppDir --plugin gtk --output appimage \
+  --executable AppDir/usr/bin/cartero \
+  --icon-file "$ICON_PATH" \
+  --desktop-file "$DESKTOP_PATH"
+
+# Patch the hook in order to support Adwaita theme.
+sed -i '/GTK_THEME/d' AppDir/apprun-hooks/linuxdeploy-plugin-gtk.sh
+sed -i '/GDK_BACKEND/d' AppDir/apprun-hooks/linuxdeploy-plugin-gtk.sh
+
+# Recompile with the changes.
+./appimagetool-x86_64.AppImage AppDir