Process exit code should be 1 for failed tests, but is instead 137

[dvasdekis]

Running a local test via docker-compose, I get exit code 137 instead of 1 when the tests fail. See below:

Running ANY failing tests via:
docker-compose up --exit-code-from pgtap --build pgtap;echo $?
I get:

Starting ccitest_pgtap_1 ... done
Attaching to ccitest_pgtap_1
pgtap_1               | Waiting for database...
pgtap_1               | 2020/02/01 01:43:55 Waiting for: tcp://postgres:5432
pgtap_1               | 2020/02/01 01:43:55 Connected to tcp://postgres:5432
pgtap_1               | 
pgtap_1               | Running tests: /test/*.sql
... test output here ...
pgtap_1               |   Failed tests:  9, 12-15
pgtap_1               |   Parse errors: Bad plan.  You planned 14 tests but ran 15.
pgtap_1               | Files=1, Tests=15, 47 wallclock secs ( 0.03 usr +  0.01 sys =  0.04 CPU)
pgtap_1               | Result: FAIL
Aborting on container exit...
Stopping ccitest_pgtap_1 ... done
137

Successful tests do correctly produce the correct exit code (0).