Redo Alpine Image and CI Updates for ClickHouse

Redo alpine image to use clean Dockerfile. Create a script in tests/ci to build both ubuntu and alpine images. Add clickhouse-keeper image (cc @nikitamikhaylov). Add build check to PullRequestCI. Add a job to a ReleaseCI. Add a job to MasterCI to build and push clickhouse/clickhouse-server:head and clickhouse/clickhouse-keeper:head images for each merged PR. #35211 (Mikhail f. Shiryaev).