add github workflow for appimages creation

.github/workflows/build-ton-linux-x86-64-appimage.yml

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+name: Ubuntu TON build (AppImages, x86-64)
+
+on: [push,workflow_dispatch,workflow_call]
+
+jobs:
+  build:
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-20.04, ubuntu-22.04, ubuntu-24.04]
+    runs-on: ${{ matrix.os }}
+
+    steps:
+    - name: Check out repository
+      uses: actions/checkout@v3
+      with:      
+        submodules: 'recursive'
+
+    - name: Install system libraries
+      run: |
+        sudo apt update
+        sudo apt install -y build-essential git cmake ninja-build libc++-dev libc++abi-dev
+        sudo apt remove libgsl-dev
+
+    - if: matrix.os != 'ubuntu-24.04'
+      run: |
+        wget https://apt.llvm.org/llvm.sh
+        chmod +x llvm.sh
+        sudo ./llvm.sh 16 all
+
+    - name: Build TON
+      run: |
+        git submodule sync --recursive
+        git submodule update
+        cp assembly/native/build-ubuntu-shared.sh .
+        chmod +x build-ubuntu-shared.sh
+        ./build-ubuntu-shared.sh -t -a
+
+    - name: Make AppImages
+      run: |
+        cp assembly/appimage/create-appimages.sh .
+        cp assembly/appimage/AppRun .
+        cp assembly/appimage/ton.png .
+        chmod +x create-appimages.sh
+        ./create-appimages.sh
+
+    - name: Upload artifacts
+      uses: actions/upload-artifact@master
+      with:
+        name: ton-appimages-${{ matrix.os }}
+        path: appimages/artifacts

assembly/appimage/AppRun

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+#!/bin/bash
+export PATH=$PATH:$(dirname "$0")/usr/bin
+cd "$(dirname $APPIMAGE)" & exec app "$@"

assembly/appimage/create-appimages.sh

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+#!/bin/bash
+
+if [ ! -d "artifacts" ]; then
+  echo "No artifacts found."
+  exit 2
+fi
+
+rm -rf appimages
+
+mkdir -p appimages/artifacts
+
+wget -nc https://github.com/AppImage/appimagetool/releases/download/continuous/appimagetool-x86_64.AppImage
+chmod +x ./appimagetool-x86_64.AppImage
+
+cd appimages
+for file in ../artifacts/*; do
+  if [[ -f "$file" && "$file" != *.so ]]; then
+    appName=$(basename "$file")
+    echo $appName
+    # prepare AppDir
+    mkdir -p $appName.AppDir/usr/{bin,lib}
+    cp ../AppRun $appName.AppDir/AppRun
+    sed -i "s/app/$appName/g" $appName.AppDir/AppRun
+    chmod +x ./$appName.AppDir/AppRun
+    printf '[Desktop Entry]\nName='$appName'\nExec='$appName'\nIcon='$appName'\nType=Application\nCategories=Utility;\n' > $appName.AppDir/$appName.desktop
+    cp ../ton.png $appName.AppDir/$appName.png
+    cp $file $appName.AppDir/usr/bin/
+    chmod +x ./$appName.AppDir/usr/bin/$appName
+    # create AppImage
+    ./../appimagetool-x86_64.AppImage $appName.AppDir
+    mv $appName-x86_64.AppImage artifacts/$appName
+  fi
+done
+
+cp -r ../artifacts/{smartcont,lib} artifacts/