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This is a docker error, not a ROS error: the docker image is telling you that it "can't connect to display :1". In more human-readable language, it's telling you that you've told it to connect to display :1 but that no such display exists.
Try running xrandr in your docker image to see if 1) it can find any displays and 2) if you're addressing the displays correctly. If the answer to 1) is no, then there's some problem with how you're launching the image. If the answer to 2) is no, xrandr should help you find what the appropriate way to address the display is. It looks to me like you may have problems with both of those steps: the display ":1" is only valid if you have two displays (the first display is ":0" because of zero indexing), and you should be able to correct that by setting the DISPLAY environment variable (right now it's not being set to anything, try -e DISPLAY=unix$DISPLAY instead).
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