remove docker build cruft #1986

Job	Run time
compile_and_lint	1m 21s
test (postgres, postgres, postgres://root:[email protected]/sqlpage)	1m 45s
test (mssql, mssql, mssql://root:[email protected]/sqlpage)	1m 56s
windows_test	2m 33s
test (mysql, mysql, mysql://root:[email protected]/sqlpage)	1m 26s
docker_build (linux/arm/v7)	9m 17s
test (odbc, postgres, Driver=PostgreSQL Unicode;Server=127.0.0.1;Port=5432;Database=sqlpage;UID=r...	2m 20s
docker_build (linux/arm64)	38s
docker_build (linux/amd64)	45s
docker_push	0s
	22m 1s

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