Reduce Image Size

[ryanemerson]

The current image is pulling in lots of unnecessary dependencies, we should remove these at build time.

We should also consider utilising jlink to create a minimal JDK.

[tristantarrant]

this is a list of unneeded packages:
adwaita-cursor-theme
adwaita-icon-theme
at-spi2-core
at-spi2-atk atk
cairo
gdk-pixbuf2
gdk-pixbuf2-modules
glib-networking
gsettings-desktop-schemas
gtk3
gtk-update-icon-cache
hicolor-icon-theme
libsoup
pango
rest

[ryanemerson]

The above packages are no longer present when utilising java-11-openjdk-headless vs java-11-openjdk.

[ryanemerson]

The image size is now down to 366MB. The next steps will be to utilise a runtime created via Jlink to further reduce the size.