Enable gzip + cache-control on CDN

[jeffposnick]

R: @philipwalton

Fixes #1412

It took a little bit of experimentation with a test project, but based on those results, this code is sufficient to enable both gzip compression and the Cache-Control header.

(Let's obviously pay close attention to the CDN uploads right after our next release.)

[philipwalton]

Sweet! Great to have this working.

[jeffposnick]

This double metadata is weird, but required...

[workbox-pr-bot]

PR-Bot Size Plugin

Changed File Sizes

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View Table

File	Before	After	Change	GZipped
packages/workbox-background-sync/build/workbox-background-sync.prod.js	3.51 KB	3.51 KB	0%	1.45 KB
packages/workbox-broadcast-cache-update/build/workbox-broadcast-cache-update.prod.js	1.12 KB	1.12 KB	0%	584 B
packages/workbox-build/build/_types.js	41 B	41 B	0%	61 B
packages/workbox-build/build/index.js	4.02 KB	4.02 KB	0%	1.57 KB
packages/workbox-cache-expiration/build/workbox-cache-expiration.prod.js	3.78 KB	3.78 KB	0%	1.33 KB
packages/workbox-cacheable-response/build/workbox-cacheable-response.prod.js	587 B	587 B	0%	345 B
packages/workbox-cli/build/app.js	6.50 KB	6.50 KB	0%	2.16 KB
packages/workbox-cli/build/bin.js	2.32 KB	2.32 KB	0%	1.03 KB
packages/workbox-core/build/workbox-core.prod.js	6.86 KB	6.86 KB	0%	2.73 KB
packages/workbox-google-analytics/build/workbox-google-analytics.prod.js	2.12 KB	2.12 KB	0%	1.03 KB
packages/workbox-precaching/build/workbox-precaching.prod.js	5.68 KB	5.68 KB	0%	2.16 KB
packages/workbox-range-requests/build/workbox-range-requests.prod.js	1.63 KB	1.63 KB	0%	797 B
packages/workbox-routing/build/workbox-routing.prod.js	2.87 KB	2.87 KB	0%	1.31 KB
packages/workbox-strategies/build/workbox-strategies.prod.js	4.30 KB	4.30 KB	0%	1.14 KB
packages/workbox-streams/build/workbox-streams.prod.js	1.66 KB	1.66 KB	0%	765 B
packages/workbox-sw/build/workbox-sw.js	1.47 KB	1.47 KB	0%	792 B
packages/workbox-webpack-plugin/build/generate-sw.js	8.04 KB	8.04 KB	0%	2.57 KB
packages/workbox-webpack-plugin/build/index.js	742 B	742 B	0%	470 B
packages/workbox-webpack-plugin/build/inject-manifest.js	10.30 KB	10.30 KB	0%	3.23 KB

Workbox Aggregate Size Plugin

9.57KB gzip'ed (64% of limit)
24.93KB uncompressed

[coveralls]

Coverage remained the same at 86.733% when pulling 7ed2f83 on gzip-cdn into f1dc3d8 on master.

[CTassisF]

Looks like that (at least) the cache-control part of this PR didn't work properly:

$ lynx -head -source https://storage.googleapis.com/workbox-cdn/releases/3.3.0/workbox-sw.js | grep -i Cache-Control
x-goog-meta-Cache-Control: max-age=31536000
Cache-Control: public, max-age=3600

[jeffposnick]

#1539 will hopefully do the trick.

(I swore that code worked for me when testing against another Cloud Storage bucket...)