chore: Add dockerfile for deployment

[bryphe-coder]

🚧 WIP 🚧

This just adds a very simple dockerfile for deploying coderd (and later provisionerd).

This adds a deploy directory at the root, and a make docker/build command to the makefile.

[codecov]

Codecov Report

Merging #180 (25ec9ec) into main (bea708d) will decrease coverage by 0.24%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #180      +/-   ##
==========================================
- Coverage   68.10%   67.85%   -0.25%     
==========================================
  Files         108      108              
  Lines        5631     5631              
  Branches       68       68              
==========================================
- Hits         3835     3821      -14     
- Misses       1436     1446      +10     
- Partials      360      364       +4     

Flag	Coverage Δ
unittest-go-macos-latest	65.66% <ø> (-0.09%)	⬇️
unittest-go-ubuntu-latest	67.06% <ø> (+0.08%)	⬆️
unittest-go-windows-latest	?
unittest-js	64.66% <ø> (ø)

Impacted Files	Coverage Δ
codersdk/provisioners.go	61.72% <0.00%> (-4.94%)	⬇️
peer/conn.go	77.43% <0.00%> (-2.31%)	⬇️
provisionerd/provisionerd.go	68.18% <0.00%> (-0.24%)	⬇️

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