Update Dockerfile (#3665)
Update Dockerfile (#3665)

- Add SHELL command
- Add opencontainers Metadata LABELS
- Add maintainer LABELS
- Install locales and tzdata

Signed-off-by: Jason Fox <f1aa33286b4f72e275d60c036757035464410675@fiware.org>
Co-authored-by: Jarno Elovirta <0f1ab0ac7dffd9db21aa539af2fd4bb04abc3ad4@elovirta.com>
dita-ot/dita-ot,infotexture/dita-ot,drmacro/dita-ot,infotexture/dita-ot,shaneataylor/dita-ot,drmacro/dita-ot,drmacro/dita-ot,dita-ot/dita-ot,drmacro/dita-ot,dita-ot/dita-ot,shaneataylor/dita-ot,shaneataylor/dita-ot,shaneataylor/dita-ot,infotexture/dita-ot,infotexture/dita-ot,shaneataylor/dita-ot,drmacro/dita-ot,dita-ot/dita-ot,infotexture/dita-ot,dita-ot/dita-ot