Add ca-certificates for runtime dependency
When you use shadowsocks/shadowsocks-libev with [v2ray-plugin](https://github.com/shadowsocks/v2ray-plugin), it may occurs `x509: certificate signed by unknown authority` error.
Current setting will cause following error: `ERROR: pull access denied for shadowsocks-libev, repository does not exist or may require 'docker login'`, this update fixes this.
* Update README.md in docker/alpine
- Replace contents with the usage of the image auto-built by Docker Cloud
- Add descriptions on the customizable environment variables
* Update Dockerfile maintainer list
Refer to #1914
* Install rng-tools as runtime dependency
* Remove unnecessary 'git submodule update', as Docker Cloud runs 'git submodule update' after cloning the repository
* Replace variable SERVER_PORT with fixed port 8388, as it can't be customized with -e anyway
* Use the repository as context, instead of released .tar.gz
* Remove version information from Dockerfile, and let Docker Cloud handle it
* Add .dockerignore
Next steps:
1. Connect repository in Docker Cloud
2. Setup automated builds:
- A push on `master` branch triggers build for `unstable` tag
- A tag matching /^v[0-9]+(\.[0-9]+){2}$/ triggers build for a same-named tag
Refer to #1914
Alpine 3.7 libtool pkg depends on bash pkg, this caused the compile hangs at "checking that generated files are newer than configure...", after check [this thread](https://forums.docker.com/t/problem-of-hanging-autoreconf/41015/3), I remove libtool and it works.
fix these errors:
- ca-certificates missed
fatal: unable to access
'https://github.com/shadowsocks/shadowsocks-libev.git/': Problem with
the SSL CA cert (path? access rights?)
- automake missed
Can't exec "aclocal": No such file or directory at
/usr/share/autoconf/Autom4te/FileUtils.pm line 326.
autoreconf: failed to run aclocal: No such file or directory
- libmbedtls-dev
checking for mbedtls_cipher_setup in -lmbedcrypto... no
configure: error: mbed TLS libraries not found.
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