add libssl-dev to Docker image

[sturman]

No description provided.

[ljharb]

Why?

[sturman]

because installation of Node.js v0.6.20 in Docker failed due to missing OpenSSL. Unfortunately, I don't have log now

[ljharb]

cc @PeterDaveHello

[sturman]

Log

nvm@9ef00ffa3b8f:~/.nvm$ nvm install 0.6.20
Detected that you have 8 CPU core(s)
Running with 7 threads to speed up the build
Downloading https://nodejs.org/dist/v0.6.20/node-v0.6.20.tar.gz...
######################################################################## 100.0%
Computing checksum with sha256sum
Checksums matched!
$>./configure --prefix=/home/nvm/.nvm/v0.6.20 <
Checking for program g++ or c++          : /usr/bin/g++ 
Checking for program cpp                 : /usr/bin/cpp 
Checking for program ar                  : /usr/bin/ar 
Checking for program ranlib              : /usr/bin/ranlib 
Checking for g++                         : ok  
Checking for program gcc or cc           : /usr/bin/gcc 
Checking for gcc                         : ok  
Checking for library dl                  : not found 
Checking for openssl                     : not found 
Checking for function SSL_library_init   : not found 
Checking for header openssl/crypto.h     : not found 
/home/nvm/.nvm/.cache/src/node-v0.6.20/files/wscript:386: error: Could not autodetect OpenSSL support. Make sure OpenSSL development packages are installed. Use configure --without-ssl to disable this message.
nvm: install v0.6.20 failed!
nvm@9ef00ffa3b8f:~/.nvm$ 

[PeterDaveHello]

I prefer to move this package upper so that we can focus and minimize the change/diff.

[ljharb]

LGTM assuming it’s ok with @PeterDaveHello

[PeterDaveHello]

LGTM now 👍

[PeterDaveHello]

The commits should be squashed into a single one.

[sturman]

@PeterDaveHello commits are squashed into single one