ARROW-3914: [C++/Python/Packaging] Docker-compose setup for Alpine linux

[kszucs]

No description provided.

[wesm]

I tried this out, it errored when importing pyarrow

===================================================================================== test session starts =====================================================================================
platform linux -- Python 3.6.6, pytest-4.0.1, py-1.7.0, pluggy-0.8.0 -- /usr/bin/python3.6
cachedir: .pytest_cache
rootdir: /, inifile:
collected 0 items / 1 errors =========================================================================================== ERRORS ============================================================================================
______________________________________________________________________________________ ERROR collecting ______________________________________________________________________________________
usr/lib/python3.6/site-packages/_pytest/config/__init__.py:430: in _importconftest
return self._conftestpath2mod[conftestpath]
E KeyError: local('/usr/lib/python3.6/site-packages/pyarrow-0.11.1.dev318+g1be15219f-py3.6-linux-x86_64.egg/pyarrow/tests/conftest.py')
During handling of the above exception, another exception occurred:
usr/lib/python3.6/site-packages/_pytest/config/__init__.py:436: in _importconftest
mod = conftestpath.pyimport()
usr/lib/python3.6/site-packages/py/_path/local.py:668: in pyimport
__import__(modname)
usr/lib/python3.6/site-packages/pyarrow-0.11.1.dev318+g1be15219f-py3.6-linux-x86_64.egg/pyarrow/__init__.py:54: in <module>
from pyarrow.lib import cpu_count, set_cpu_count
E ImportError: Error loading shared library libarrow.so.12: No such file or directory (needed by /usr/lib/python3.6/site-packages/pyarrow-0.11.1.dev318+g1be15219f-py3.6-linux-x86_64.egg/pyarrow/lib.cpython-36m-x86_64-linux-gnu.so)
During handling of the above exception, another exception occurred:
usr/lib/python3.6/site-packages/py/_path/common.py:377: in visit
for x in Visitor(fil, rec, ignore, bf, sort).gen(self):
usr/lib/python3.6/site-packages/py/_path/common.py:418: in gen
dirs = self.optsort([p for p in entries
usr/lib/python3.6/site-packages/py/_path/common.py:419: in <listcomp>
if p.check(dir=1) and (rec is None or rec(p))])
usr/lib/python3.6/site-packages/_pytest/main.py:617: in _recurse
ihook = self.gethookproxy(dirpath)
usr/lib/python3.6/site-packages/_pytest/main.py:434: in gethookproxy
my_conftestmodules = pm._getconftestmodules(fspath)
usr/lib/python3.6/site-packages/_pytest/config/__init__.py:414: in _getconftestmodules
mod = self._importconftest(conftestpath)
usr/lib/python3.6/site-packages/_pytest/config/__init__.py:453: in _importconftest
raise ConftestImportFailure(conftestpath, sys.exc_info())
E _pytest.config.ConftestImportFailure: (local('/usr/lib/python3.6/site-packages/pyarrow-0.11.1.dev318+g1be15219f-py3.6-linux-x86_64.egg/pyarrow/tests/conftest.py'), (<class 'ImportError'>, ImportError('Error loading shared library libarrow.so.12: No such file or directory 

[kszucs]

@wesm docker crossbow tests here,

expect the JSON integration tests to segfault, see: ARROW-3927 (indeed failed)

[wesm]

+1, thank you! Figure we can address the test failure in a follow up PR