Fix AppImage not containing all SSL dependencies (#4400)

This means the AppImage is built on Ubuntu 20.04 using Qt 5.12

.CI/CreateAppImage.sh

@@ -2,13 +2,18 @@
 
 set -e
 
+# Print all commands as they are run
+set -x
+
 if [ ! -f ./bin/chatterino ] || [ ! -x ./bin/chatterino ]; then
     echo "ERROR: No chatterino binary file found. This script must be run in the build folder, and chatterino must be built first."
     exit 1
 fi
 
-export LD_LIBRARY_PATH="$LD_LIBRARY_PATH:/opt/qt512/lib/"
-export PATH="/opt/qt512/bin:$PATH"
+echo "Qt5_DIR set to: ${Qt5_DIR}"
+
+export LD_LIBRARY_PATH="$LD_LIBRARY_PATH:${Qt5_DIR}/lib"
+export PATH="${Qt5_DIR}/bin:$PATH"
 
 script_path=$(readlink -f "$0")
 script_dir=$(dirname "$script_path")
@@ -25,20 +30,32 @@ echo ""
 
 cp "$chatterino_dir"/resources/icon.png ./appdir/chatterino.png
 
-linuxdeployqt_path="linuxdeployqt-6-x86_64.AppImage"
-linuxdeployqt_url="https://github.com/probonopd/linuxdeployqt/releases/download/6/linuxdeployqt-6-x86_64.AppImage"
+linuxdeployqt_path="linuxdeployqt-x86_64.AppImage"
+linuxdeployqt_url="https://github.com/probonopd/linuxdeployqt/releases/download/continuous/linuxdeployqt-continuous-x86_64.AppImage"
 
 if [ ! -f "$linuxdeployqt_path" ]; then
-    wget -nv "$linuxdeployqt_url"
+    echo "Downloading LinuxDeployQT from $linuxdeployqt_url to $linuxdeployqt_path"
+    curl --location --fail --silent "$linuxdeployqt_url" -o "$linuxdeployqt_path"
     chmod a+x "$linuxdeployqt_path"
 fi
-if [ ! -f appimagetool-x86_64.AppImage ]; then
-    wget -nv "https://github.com/AppImage/AppImageKit/releases/download/continuous/appimagetool-x86_64.AppImage"
-    chmod a+x appimagetool-x86_64.AppImage
+
+appimagetool_path="appimagetool-x86_64.AppImage"
+appimagetool_url="https://github.com/AppImage/AppImageKit/releases/download/continuous/appimagetool-x86_64.AppImage"
+
+if [ ! -f "$appimagetool_path" ]; then
+    echo "Downloading AppImageTool from $appimagetool_url to $appimagetool_path"
+    curl --location --fail --silent "$appimagetool_url" -o "$appimagetool_path"
+    chmod a+x "$appimagetool_path"
 fi
+
+# For some reason, the copyright file for libc was not found. We need to manually copy it from the host system
+mkdir -p appdir/usr/share/doc/libc6/
+cp /usr/share/doc/libc6/copyright appdir/usr/share/doc/libc6/
+
 echo "Run LinuxDeployQT"
 ./"$linuxdeployqt_path" \
-    appdir/usr/share/applications/*.desktop \
+    --appimage-extract-and-run \
+    appdir/usr/share/applications/com.chatterino.chatterino.desktop \
     -no-translations \
     -bundle-non-qt-libs \
     -unsupported-allow-new-glibc
@@ -56,7 +73,9 @@ cd "$here/usr"
 exec "$here/usr/bin/chatterino" "$@"' > appdir/AppRun
 chmod a+x appdir/AppRun
 
-./appimagetool-x86_64.AppImage appdir
+./"$appimagetool_path" \
+    --appimage-extract-and-run \
+    appdir
 
 # TODO: Create appimage in a unique directory instead maybe idk?
 rm -rf appdir