feat(docker): improve dockerfile build (#220)

* refactor(docker): remove unnecessary root user

The USER root directive isn't needed directly after FROM

Signed-off-by: Sebastian Yaghoubi <sebastianyaghoubi@gmail.com>

* fix(docker): use generic nobody nogroup default instead of uid gid

Signed-off-by: Sebastian Yaghoubi <sebastianyaghoubi@gmail.com>

* fix(docker): build app from source locally instead of installing package

Signed-off-by: Sebastian Yaghoubi <sebastianyaghoubi@gmail.com>

* fix(docker): use correct files in dockerignore

Signed-off-by: Sebastian Yaghoubi <sebastianyaghoubi@gmail.com>

* chore(docker): dont install recommended packages with git

Signed-off-by: Sebastian Yaghoubi <sebastianyaghoubi@gmail.com>

* fix(docker): run apt as non-interactive

Signed-off-by: Sebastian Yaghoubi <sebastianyaghoubi@gmail.com>

* Update Dockerfile to new package structure, and fix streaming bugs.

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Signed-off-by: Sebastian Yaghoubi <sebastianyaghoubi@gmail.com>
Co-authored-by: afourney <adamfo@microsoft.com>