deploy: mount persistable directory

[bobheadxi]

🎟️ Ticket(s): Closes #583

---

👷 Changes

A persisted directory is now mounted in both docker-compose and dockerfile deployments that projects can use to persist data, available as /persist:

https://github.com/ubclaunchpad/inertia/compare/deploy/persist-dir?expand=1#diff-cf2820f13d3ad9520509ce47a551e459R269

https://github.com/ubclaunchpad/inertia/compare/deploy/persist-dir?expand=1#diff-cf2820f13d3ad9520509ce47a551e459R269

[codecov]

Codecov Report

Merging #653 into master will decrease coverage by 0.01%.
The diff coverage is 61.91%.

@@            Coverage Diff             @@
##           master     #653      +/-   ##
==========================================
- Coverage   55.56%   55.56%   -0.00%     
==========================================
  Files          67       67              
  Lines        3393     3404      +11     
==========================================
+ Hits         1885     1891       +6     
- Misses       1265     1269       +4     
- Partials      243      244       +1     

Impacted Files	Coverage Δ
daemon/inertiad/project/deployment.go	32.62% <40.00%> (-0.13%)	⬇️
daemon/inertiad/build/builder.go	74.20% <80.00%> (-0.30%)	⬇️
daemon/inertiad/cfg/config.go	100.00% <100.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 1dc8d02...881777f. Read the comment docs.