Add imagemagick to apt-publisher Makefile

apt-publisher/Makefile

@@ -30,6 +30,7 @@ prepare-packages-ubuntu1804:
 	        fmt/pkg/*.deb \
 	        pngpp/pkg/*.deb \
 	        openexr/pkg/*.deb \
+	        imagemagick/pkg/*.deb \
 	        \
 	        msxsaver/pkg/*.deb \
 	        \
@@ -47,6 +48,7 @@ prepare-packages-ubuntu2004:
 	        seasocks/pkg/*.deb \
 	        fmt/pkg/*.deb \
 	        openexr/pkg/*.deb \
+	        imagemagick/pkg/*.deb \
 	        pngpp/pkg/*.deb \
 	        msxsaver/pkg/*.deb \
 	            packages/