remove docker build cruft #1985

Job	Run time
compile_and_lint	1m 16s
test (postgres, postgres, postgres://root:[email protected]/sqlpage)	2m 10s
test (mssql, mssql, mssql://root:[email protected]/sqlpage)	1m 37s
test (mysql, mysql, mysql://root:[email protected]/sqlpage)	1m 19s
windows_test	2m 41s
test (odbc, postgres, Driver=PostgreSQL Unicode;Server=127.0.0.1;Port=5432;Database=sqlpage;UID=r...	1m 47s
docker_build (linux/arm64)	9m 22s
docker_build (linux/arm/v7)	1m 43s
docker_build (linux/amd64)	8m 21s
docker_push	-1s
	30m 15s

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