remove docker build cruft (#1115) #1988

Job	Run time
compile_and_lint	1m 17s
test (postgres, postgres, postgres://root:[email protected]/sqlpage)	1m 49s
docker_build (linux/amd64)	9m 16s
docker_build (linux/arm/v7)	10m 15s
test (mssql, mssql, mssql://root:[email protected]/sqlpage)	1m 33s
windows_test	2m 35s
test (mysql, mysql, mysql://root:[email protected]/sqlpage)	1m 29s
docker_build (linux/arm64)	10m 6s
test (odbc, postgres, Driver=PostgreSQL Unicode;Server=127.0.0.1;Port=5432;Database=sqlpage;UID=r...	1m 50s
docker_push	20s
	40m 30s

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