Passes SSL_CERT_FILE to wal-e.d/env to allow wal_e uploads to S3 with…

[mheers]

… custom certificate

Right now the SSL_CERT_FILE needed by the python script is not created in /run/etc/wal-e.d/env so envdir "/run/etc/wal-e.d/env" wal-e backup-push fails with

Traceback (most recent call last):
  File "src/gevent/greenlet.py", line 906, in gevent._gevent_cgreenlet.Greenlet.run
  File "/usr/local/lib/python3.10/dist-packages/wal_e/worker/upload.py", line 52, in __call__
    kib_per_second = do_lzop_put(self.creds, url, segment.path,
  File "/usr/local/lib/python3.10/dist-packages/wal_e/worker/worker_util.py", line 40, in do_lzop_put
    k = blobstore.uri_put_file(creds, url, tf)
  File "/usr/local/lib/python3.10/dist-packages/wal_e/blobstore/s3/s3_util.py", line 58, in uri_put_file
    k.set_contents_from_file(fp, encrypt_key=(not disable_encryption))
  File "/usr/lib/python3/dist-packages/boto/s3/key.py", line 1307, in set_contents_from_file
    self.send_file(fp, headers=headers, cb=cb, num_cb=num_cb,
  File "/usr/lib/python3/dist-packages/boto/s3/key.py", line 760, in send_file
    self._send_file_internal(fp, headers=headers, cb=cb, num_cb=num_cb,
  File "/usr/lib/python3/dist-packages/boto/s3/key.py", line 957, in _send_file_internal
    resp = self.bucket.connection.make_request(
  File "/usr/lib/python3/dist-packages/boto/s3/connection.py", line 667, in make_request
    return super(S3Connection, self).make_request(
  File "/usr/lib/python3/dist-packages/boto/connection.py", line 1070, in make_request
    return self._mexe(http_request, sender, override_num_retries,
  File "/usr/lib/python3/dist-packages/boto/connection.py", line 1030, in _mexe
    raise ex
  File "/usr/lib/python3/dist-packages/boto/connection.py", line 939, in _mexe
    response = sender(connection, request.method, request.path,
  File "/usr/lib/python3/dist-packages/boto/s3/key.py", line 803, in sender
    http_conn.endheaders()
  File "/usr/lib/python3.10/http/client.py", line 1278, in endheaders
    self._send_output(message_body, encode_chunked=encode_chunked)
  File "/usr/lib/python3.10/http/client.py", line 1038, in _send_output
    self.send(msg)
  File "/usr/lib/python3.10/http/client.py", line 976, in send
    self.connect()
  File "/usr/lib/python3.10/http/client.py", line 1455, in connect
    self.sock = self._context.wrap_socket(self.sock,
  File "/usr/lib/python3/dist-packages/gevent/_ssl3.py", line 114, in wrap_socket
    return self.sslsocket_class(
  File "/usr/lib/python3/dist-packages/gevent/_ssl3.py", line 312, in __init__
    raise x
  File "/usr/lib/python3/dist-packages/gevent/_ssl3.py", line 308, in __init__
    self.do_handshake()
  File "/usr/lib/python3/dist-packages/gevent/_ssl3.py", line 667, in do_handshake
    self._sslobj.do_handshake()
ssl.SSLCertVerificationError: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:1007)
2024-08-08T11:54:39Z <Greenlet at 0x7fb529041000: <wal_e.worker.upload.WalUploader object at 0x7fb5291d1ff0>(<wal_e.worker.pg.wal_transfer.WalSegment object at)> failed with SSLCertVerificationError

FYI: Setting WALG_S3_CA_CERT_FILE does not have any effect here.