snap: added snap manifest

snap/gui/heroic.desktop

@@ -0,0 +1,12 @@
+[Desktop Entry]
+#Name=Heroic Games Launcher
+Name=Heroic Snap
+Exec=heroic %u
+Terminal=false
+Type=Application
+Icon=${SNAP}/meta/gui/heroic.png
+StartupWMClass=Heroic
+Comment=An Open Source GOG and Epic Games launcher
+Comment[de]=Ein Open Source Spielelauncher for GOG und Epic Games
+MimeType=x-scheme-handler/heroic;
+Categories=Game;

snap/hooks/configure

@@ -0,0 +1,45 @@
+#!/bin/sh
+
+# https://github.com/canonical/steam-snap/issues/19#issuecomment-1171984524
+# https://gist.github.com/jhenstridge/425c769949d034033f3d5d90acc2f181
+
+set -e
+
+mkdir -p $SNAP_DATA/etc
+
+snap_ld_so_conf=$SNAP_DATA/etc/snap-ld.so.conf
+snap_ld_so_cache=$SNAP_DATA/etc/snap-ld.so.cache
+real_ld_so_cache=$SNAP_DATA/etc/ld.so.cache
+
+RUNTIME=$SNAP/gnome-platform
+
+cat > "$snap_ld_so_conf" <<EOF
+/var/lib/snapd/lib/gl
+/var/lib/snapd/lib/gl32
+$SNAP/lib/x86_64-linux-gnu
+$SNAP/lib/i386-linux-gnu
+$SNAP/lib
+$SNAP/usr/lib/x86_64-linux-gnu
+$SNAP/usr/lib/x86_64-linux-gnu/pulseaudio
+$SNAP/usr/lib/i386-linux-gnu
+$SNAP/usr/lib
+$SNAP/usr/lib/x86_64-linux-gnu/dri
+$SNAP/usr/lib/i386-linux-gnu/dri
+$SNAP/usr/lib/i386-linux-gnu/pulseaudio
+$SNAP/graphics/lib
+$SNAP/graphics/usr/lib
+$SNAP/graphics/usr/lib/i386-linux-gnu
+$SNAP/graphics/usr/lib/x86_64-linux-gnu
+$SNAP/graphics/usr/lib/i386-linux-gnu/dri
+$SNAP/graphics/usr/lib/x86_64-linux-gnu/dri
+/lib/x86_64-linux-gnu
+/lib/i386-linux-gnu
+/usr/lib/x86_64-linux-gnu
+/usr/lib/i386-linux-gnu
+EOF
+
+ldconfig -X -f $snap_ld_so_conf -C $snap_ld_so_cache
+
+# We need to update the real ld.so.cache in place rather than moving
+# over the top of it, since it is the source of a bind mount.
+cat $snap_ld_so_cache > $real_ld_so_cache