Allow memory_limit to be configurable #1299

Job	Run time
static-analysis (8.2, cs)	45s
static-analysis (8.2, stan)	44s
static-analysis (8.2, swagger:validate)	30s
api-tests / tests (8.2)	1m 2s
cli-tests / tests (8.2)	43s
unit-tests / tests (8.2)	31s
api-tests / tests (8.3)	1m 10s
unit-tests / tests (8.3)	23s
cli-tests / tests (8.3)	29s
db-tests (maria) / db-tests (8.2)	41s
db-tests (maria) / db-tests (8.3)	31s
db-tests (ms) / db-tests (8.2)	1m 4s
db-tests (ms) / db-tests (8.3)	48s
db-tests (mysql) / db-tests (8.2)	47s
db-tests (postgres) / db-tests (8.2)	39s
db-tests (mysql) / db-tests (8.3)	32s
db-tests (postgres) / db-tests (8.3)	25s
db-tests (sqlite:ci) / db-tests (8.2)	25s
db-tests (sqlite:ci) / db-tests (8.3)	25s
upload-coverage (8.2)	30s
delete-artifacts	1s
	13m 5s

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