GitHub CI: ARM build - use appimagetool 12

Git master version now doesn't contain the original build.sh script but
only docker one, which is difficult to use now.

+ added patch to compile

.github/workflows/arm-build.yml

@@ -38,6 +38,7 @@ jobs:
         sudo mkdir chroot
         wget http://archive.raspbian.org/raspbian.public.key -O - | sudo apt-key add -q
         sudo qemu-debootstrap --keyring=${{ matrix.keyring }} --arch ${{ matrix.arch }} buster chroot ${{ matrix.repo }}
+        sudo cp $GITHUB_WORKSPACE/.github/scripts/Linux/arm/mksquashfs-compilation-fix.patch chroot
         sudo .github/scripts/Linux/arm/bootstrap.sh ${{ matrix.arch }} chroot
         sudo tar cf chroot.tar chroot # Create archive for caching. Needs to be created as root, therefore created manually.
     - name: Extract Cached Environment