Standardize CI

[phil-davis]

Issue #269

• get rid of phpunit and lint from local composer
• standardize Makefile and .drone.yml like other apps
• add phan and phpstan configs so they can be run in future

[codecov]

Codecov Report

Merging #273 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #273   +/-   ##
=========================================
  Coverage     67.27%   67.27%           
  Complexity       25       25           
=========================================
  Files             4        4           
  Lines           110      110           
=========================================
  Hits             74       74           
  Misses           36       36

---

Continue to review full report at Codecov.

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Δ = absolute <relative> (impact), ø = not affected, ? = missing data
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[codecov]

Codecov Report

Merging #273 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #273   +/-   ##
=========================================
  Coverage     67.27%   67.27%           
  Complexity       25       25           
=========================================
  Files             4        4           
  Lines           110      110           
=========================================
  Hits             74       74           
  Misses           36       36

---

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 638d5dc...44c2636. Read the comment docs.