Update Dockerfile: install ca-certificates package #2
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Without `ca-certificates` TLS will not work, at all.
...is the latest with offlineimap
...because:
```
ERROR: Unknown SSL protocol connecting to host 'example.com' for repository 'test-remote'. OpenSSL responded:
[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:727)
Traceback:
File "/usr/lib/python2.7/site-packages/offlineimap/accounts.py", line 293, in syncrunner
self.__sync()
File "/usr/lib/python2.7/site-packages/offlineimap/accounts.py", line 369, in __sync
remoterepos.getfolders()
File "/usr/lib/python2.7/site-packages/offlineimap/repository/IMAP.py", line 452, in getfolders
imapobj = self.imapserver.acquireconnection()
File "/usr/lib/python2.7/site-packages/offlineimap/imapserver.py", line 658, in acquireconnection
exc_info()[2])
File "/usr/lib/python2.7/site-packages/offlineimap/imapserver.py", line 572, in acquireconnection
af=self.af,
File "/usr/lib/python2.7/site-packages/offlineimap/imaplibutil.py", line 194, in __init__
super(WrappedIMAP4_SSL, self).__init__(*args, **kwargs)
File "/usr/lib/python2.7/site-packages/offlineimap/bundled_imaplib2.py", line 2183, in __init__
IMAP4.__init__(self, host, port, debug, debug_file, identifier, timeout, debug_buf_lvl)
File "/usr/lib/python2.7/site-packages/offlineimap/bundled_imaplib2.py", line 361, in __init__
self.open(host, port)
File "/usr/lib/python2.7/site-packages/offlineimap/imaplibutil.py", line 202, in open
super(WrappedIMAP4_SSL, self).open(host, port)
File "/usr/lib/python2.7/site-packages/offlineimap/bundled_imaplib2.py", line 2196, in open
self.ssl_wrap_socket()
File "/usr/lib/python2.7/site-packages/offlineimap/bundled_imaplib2.py", line 548, in ssl_wrap_socket
self.sock = ssl.wrap_socket(self.sock, self.keyfile, self.certfile, ca_certs=self.ca_certs, cert_reqs=cert_reqs, ssl_version=ssl_version)
File "/usr/lib/python2.7/ssl.py", line 931, in wrap_socket
ciphers=ciphers)
File "/usr/lib/python2.7/ssl.py", line 599, in __init__
self.do_handshake()
File "/usr/lib/python2.7/ssl.py", line 828, in do_handshake
self._sslobj.do_handshake()
```
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Without
ca-certificatesTLS will not work, at all. Fixes #1