Test new linux prebuild

[vweevers]

Since #674, our prebuilt binary for linux is made on CentOS 7 rather than Ubuntu 16.04, making the binary compatible with Debian 8, Ubuntu 14.04, RHEL 7, CentOS 7. Before releasing 5.3.0 we'd like to test the binary on various linux flavors, including those we already supported.

To do so, run npm i leveldown@next (5.3.0-0). If it unexpectedly falls back to compiling, raise your hand. If you have time to spare, also run a more thorough test:

git clone --recurse-submodules https://github.com/Level/leveldown.git
cd leveldown
rm build/ -rf
npm install
npm run download-prebuilds
npm run test-prebuild

Comment below with results. Thanks!

@ralphtheninja @rvagg @peakji

[vweevers]

Install works and tests pass in these docker images:

• node:lts-jessie
• node:lts-stretch
• node:lts-buster
• node:lts-alpine
• centos/nodejs-10-centos7

[vweevers]

Also OK on:

• Ubuntu Server 17.04 with node 12.11.1
• Amazon Linux 2 with node 8.16.0

[vweevers]

On FreeBSD 12.0 with node 12.8.1, the prebuild fails to load with:

Error: Shared object "libstdc++.so.6" not found, required by "node.napi.node"

But node-gyp-build correctly falls back to compiling. Tests pass too.

[ralphtheninja]

Ok on Ubuntu 19.04 with node 12.11.1

[rvagg]

Weirdly it even worked on an Ubuntu 12.04 system I happen to have running, with Node 10. That's an older libc but maybe it's not getting newer symbols involved. So that's pretty impressive.

[peakji]

Ok on RedHat RHEL 7.2, with node LTS

[vweevers]

So, good to release?

[vweevers]

Released 5.3.0 (took a while due to queued CI jobs). Thanks all!