trying to make comprehensive builder/boilerplate

app.metainfo.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<component type="desktop-application">
+  <id></id>
+  <metadata_license>CC0-1.0</metadata_license>
+  <!-- Also available FSFAP MIT 0BSD CC0-1.0 CC0-1.0 CC-BY-3.0 CC-BY-4.0 CC-BY-SA-3.0 CC-BY-SA-4.0 GFDL-1.1 GFDL-1.2 GFDL-1.3 BSL-1.0 FTL FSFUL -->
+  <name></name>
+  <summary></summary>
+  <summary xml:lang=""></summary>
+  <description>
+    <p>Steam is a software distribution service with an online store, automated installation, automatic updates, achievements, SteamCloud synchronized savegame and screenshot functionality, and many social features.</p>
+  </description>
+    <!-- Follow this guideline https://specifications.freedesktop.org/menu-spec/latest/category-registry.html-->
+  <categories>
+    <category></category>
+    <category></category>
+  </categories>
+  <url type="homepage"></url>
+  <url type="bugtracker"></url>
+  <url type="faq"></url>
+  <url type="help"></url>
+  <url type="donation"></url>
+  <url type="translate"></url>
+  <url type="contact"></url>
+  <url type="vcs-browser"></url>
+  <url type="contribute"></url>
+  <!-- Please follow SPDX License expressions https://spdx.org/specifications -->
+  <project_license>LicenseRef-proprietary=https://example.com/mylicense.html</project_license>
+  <developer></developer>
+  <screenshots>
+    <screenshot type="default">
+      <caption></caption>
+      <caption xml:lang=""></caption>
+      <image type="source" width="1200" height="1026"></image>
+    </screenshot>
+  </screenshots>
+  <launchable type="desktop-id"></launchable>
+  <releases>
+    <release version="1.0.0.82" date="2024-10-03">
+      <description></description>
+    </release>
+  </releases>
+  <bundle type="appimage">pkgname-pkgversion</bundle> 
+  <content_rating type="oars-1.1">
+  <!-- Can be generated via https://hughsie.github.io/oars/generate.html -->
+    <content_attribute id="social-chat">intense</content_attribute>
+  </content_rating>
+</component>

template.sh.in

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+#!/bin/sh
+
+## arguments for script and run
+
+set -eu
+export ARCH="$(uname -m)"
+export APPIMAGE_EXTRACT_AND_RUN=1
+
+## tools that will be used next
+APPIMAGETOOL="https://github.com/AppImage/appimagetool/releases/download/continuous/appimagetool-$ARCH.AppImage"
+LIB4BN="https://raw.githubusercontent.com/VHSgunzo/sharun/refs/heads/main/lib4bin"
+URUNTIME="$(wget -q https://api.github.com/repos/VHSgunzo/uruntime/releases -O - \
+	| sed 's/[()",{} ]/\n/g' | grep -oi "https.*appimage.*dwarfs.*$ARCH$" | head -1)"
+
+
+## useful meta for appimagetool
+## APP_NAME=
+## DESKTOP=
+## ICON=
+UPINFO="gh-releases-zsync|$(echo "$REPO" | tr '/' '|')|latest|*$ARCH.AppImage.zsync"
+
+
+make_appdir() {
+    mkdir -p .AppDir
+    mkdir -p .AppDir/share/icon
+    mkdir -p .AppDir/share/metainfo
+    mkdir -p .AppDir/lib
+    mkdir -p .AppDir/bin
+}
+
+build() {
+    CURRENTDIR="$(readlink -f "$(dirname "$0")")"
+    git clone $REPO
+}
+
+sharun() {
+    ln -s ./bin/$APP ./AppRun
+    ./sharun -g
+}
+
+generate_app() {
+    printf "$UPINFO" > data.upd_info
+    llvm-objcopy --update-section=.upd_info=data.upd_info \
+    --set-section-flags=.upd_info=noload,readonly ./uruntime
+    printf 'AI\x02' | dd of=./uruntime bs=1 count=3 seek=8 conv=notrunc
+    wget -q "$URUNTIME" -O ./uruntime
+    chmod +x ./uruntime
+    ./uruntime --appimage-mkdwarfs -f \
+	--set-owner 0 --set-group 0 \
+	--no-history --no-create-timestamp \
+	--compression zstd:level=22 -S24 -B16 \
+	--header uruntime \
+	-i ./AppDir -o "$PACKAGE"-"$VERSION"-anylinux-"$ARCH".AppImage
+}