Fix for missing library

pkg/appimage/appimage.sh

@@ -14,6 +14,9 @@ make
 make INSTALL_ROOT="${PKGNAME}.AppDir" install
 
 ./squashfs-root/AppRun ${PKGNAME}.AppDir/usr/share/applications/${PKGNAME}.desktop -bundle-non-qt-libs -no-translations
+
+install -D -m 755 /lib/x86_64-linux-gnu/libz.so.1 ${PKGNAME}.AppDir/usr/lib/libz.so.1
+
 ./squashfs-root/AppRun ${PKGNAME}.AppDir/usr/share/applications/${PKGNAME}.desktop -appimage
 
 mv *.AppImage ${PKGNAME}-${PKGVER}-${PKGREL}-x86_64.AppImage

scripts/build-docker.sh

@@ -37,6 +37,7 @@ build_appimage() {
     # docker-image: ubuntu:17.10
     apt update -qq
     apt -y install build-essential qt5-default libqt5websockets5-dev
+    apt -y install zlib1g
     apt -y install git
     apt -y install curl