feat: new GDM greeter logo

Text in logo is capitalized (YourDev instead of yourdev)
Image file is installed in /usr/share/orange-yourdev-login

images/xcf2png-one.sh

@@ -0,0 +1,27 @@
+#!/bin/bash
+
+if (( $# == 0 )) ; then
+    echo "Missing argument." >&2
+    exit 1
+fi
+
+INFILE="$1" OUTFILE="$2"
+if [[ ! -e "$INFILE" ]] ; then
+    echo "File not found: '$INFILE'" >&2
+    exit 1
+fi
+if [[ -z "$OUTFILE" ]] ; then
+    OUTFILE="$(basename "$INFILE" .xcf).png"
+fi
+
+# taken from https://stackoverflow.com/a/5846727
+gimp -n -i -b - <<EOF
+(let* ( (infile "${INFILE}") (outfile "${OUTFILE}") (image 0) (layer 0) )
+    (set! image (car (gimp-file-load RUN-NONINTERACTIVE infile infile)))
+    (set! layer (car (gimp-image-merge-visible-layers image CLIP-TO-IMAGE)))
+    (gimp-file-save RUN-NONINTERACTIVE image layer outfile outfile)
+    (gimp-image-delete image)
+  (gimp-quit 0)
+  )
+EOF
+