Include prebuilt binary for alpine

[gogoout]

Hi all, Alpine is commonly used in container environment.
Currently seems alpine seems doesn't have a prebuilt binary. Not sure if this is a low hanging fruit.

[vweevers]

Assuming that RocksDB compiles against musl (no reason to believe it doesn't), this should be easy. We do the same for leveldown. It's a matter of adding -i alpine to:

rocksdb/package.json

Line 16 in 5c8e0b9

"prebuild-linux": "prebuildify-cross -i centos7-devtoolset7 -t 8.14.0 --napi --strip",

If no one is opposed to increasing npm package size. I'm fine with that.

[reuzel]

Great work!

Is there any ETA for the next release in which this binary will be prepackaged?

[vweevers]

When I have a free moment, within a week.

[gogoout]

Hi, any updates on releasing?

[vweevers]

5.1.0