Merge pull request 'Upload files to "pdf"' (#4) from p3 into master

Reviewed-on: http://10.2.0.2:3000/jason/cpas/pulls/4

pdf/generator.js

@@ -1,8 +1,9 @@
-const puppeteer = require('puppeteer');
+const puppeteer  = require('puppeteer-core');
 const buildHtml  = require('./template');
 
 /**
  * Renders the violation document HTML via Puppeteer and returns a PDF buffer.
+ * Uses the system Chromium installed in the Alpine image (no separate download).
  * @param {object} violation  - Row from violations JOIN employees
  * @param {object} score      - Row from active_cpas_scores
  * @returns {Buffer}