🐛 FIX: Pin psycopg2-binary to 2.8.x

[chrisjsewell]

I think psycopg2 2.9 (released yesterday: psycopg/psycopg2@5014501) has just broken all the testing 😬

See: https://github.com/aiidaplugins/aiida-lammps/pull/26/checks?check_run_id=2848451163

    @pytest.fixture(scope='session', autouse=True)
    def aiida_profile():
        """Set up AiiDA test profile for the duration of the tests.
    
        Note: scope='session' limits this fixture to run once per session. Thanks to ``autouse=True``, you don't actually
         need to depend on it explicitly - it will activate as soon as you import it in your ``conftest.py``.
        """
>       with test_manager(backend=get_test_backend_name(), profile_name=get_test_profile_name()) as manager:

...

command = 'CREATE DATABASE "aiida_db" OWNER "aiida" ENCODING \'UTF8\' LC_COLLATE=\'en_US.UTF-8\' LC_CTYPE=\'en_US.UTF-8\' TEMPLATE=template0'
dsn = {'database': 'postgres', 'host': 'localhost', 'password': None, 'port': 58049, ...}

    def _execute_psyco(command, dsn):
        """
        executes a postgres commandline through psycopg2
    
        :param command: A psql command line as a str
        :param dsn: will be forwarded to psycopg2.connect
        """
        import psycopg2  # pylint: disable=import-outside-toplevel
    
        output = None
        with psycopg2.connect(**dsn) as conn:
            conn.autocommit = True
            with conn.cursor() as cursor:
>               cursor.execute(command)
E               psycopg2.errors.ActiveSqlTransaction: CREATE DATABASE cannot run inside a transaction block

related:

• https://stackoverflow.com/questions/34484066/create-a-postgres-database-using-python

cc @csadorf @giovannipizzi @sphuber @ltalirz

[chrisjsewell]

Obviously this is a band-aid over what looks like might require a "deeper" fix

[codecov]

Codecov Report

Merging #4989 (c23996d) into develop (f4f543c) will increase coverage by 0.01%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop    #4989      +/-   ##
===========================================
+ Coverage    80.11%   80.11%   +0.01%     
===========================================
  Files          515      515              
  Lines        36676    36676              
===========================================
+ Hits         29380    29381       +1     
+ Misses        7296     7295       -1     

Flag	Coverage Δ
django	74.58% <ø> (+0.03%)	⬆️
sqlalchemy	73.51% <ø> (+0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
aiida/transports/util.py	65.63% <0.00%> (+3.13%)	⬆️

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[csadorf]

Thx for fixing!