add xxd to community Dockerfile
Description
Issue(s)
user was missing 'xxd' when building "tissot", see https://community.e.foundation/t/xiaomi-mi-a1-tissot-for-e-os-t-v2-1/58598/4
might be a good idea to sync the whole apt-get section between Dockerfile / Dockerfile.community (for simg2img / img2simg)
Test procedures
running a docker build error free is a good test.
Check list
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Self review -
Test procedure explained -
Tested on fresh install -
Tested applied as an update -
License -
Internal documentation -
User documentation