add gpg public_key ipmort

Changelog

@@ -2,8 +2,42 @@ Changelog for LXTools installer
 
 ## [Unreleased]
 
- - 
+- In the future, lxtools_installer will use the /tmp working 
+  directory for extracting necessary files from the AppImage. Currently, 
+  required files are extracted into separate folders using additional 
+  methods, which would then be removed. Depending on how the installer 
+  is called, examples include being invoked in the home directory where 
+  needed folders and files are unpacked there, and upon closing the app, 
+  these unpacked files will be automatically deleted. Additionally, 
+  a folder is created in the /tmp directory. This folder is used 
+  when the installer is called from an installed program to avoid 
+  permission issues and to prevent extracting into a bin folder.
 
+  ### Added
+09.07.2025
+
+- gpg check, download and import public_key.asc from two sources
+  automatically and check if the signature is valid
+
+- Check checksumm and signature of the AppImage-File
+
+- Methods for checking pkexec and NetworkManager extended for Fedora 
+  and Open Suse if it is displayed incorrectly, the appimage can be started 
+  in terminal to see where the problem is
+
+  ### Added
+02.07.2025
+
+- build dockercontainer (ubuntu 22.04) for build appimage 
+  the app installer is now running on Debian 12
+
+- first complete test runs on Debian12, Linux Mint 22.1,
+  Open Suse (Leap and Thumbleweed) and Fedora, 
+  at Arch linux the installer starts only if xorg-xrandr is missing
+
+- the installable programs also run on all systems mentioned 
+  and should also be running on other derivatives.  
+ 
 
   ### Added
 29.06.2025
@@ -16,6 +50,7 @@ Changelog for LXTools installer
 - add methods check polkit and check Networkmanager is installed 
   and view in header is result false
 
+
   ### Added
 23-06-2025
 
@@ -37,6 +72,7 @@ Changelog for LXTools installer
   version ud the respective recognized system to run with 
   it on all supported systems.
 
+
   ### Added
 21-06-2025 
 
@@ -57,6 +93,7 @@ Changelog for LXTools installer
 
  - Installer divided into several modules and added new MessageDialog module
 
+
    ### Added
 4-06-2025
 
@@ -65,6 +102,7 @@ Changelog for LXTools installer
 
  - add ensure_shared_libs_pth_exists Script to install
 
+
    ### Added
 4-06-2025