Stop pushing new images to DockerHub #2625

Job	Run time
Lint bash, docker, markdown, and yaml	1m 22s
Validate GNU Docker image builds	52s
Validate musl Docker image builds	18s
Validate musl Docker release image builds	17s
Validate Windows Docker image builds	1m 57s
aarch64 Linux glibc	21m 25s
armhf Linux glibc	1h 10m 9s
arm Linux glibc	1h 11m 46s
riscv64 Linux glibc	1h 6m 15s
Validate GNU Docker release image builds	36s
Validate Windows Docker release image builds	1m 16s
Verify CHANGELOG is valid	6s
x86-64 Linux glibc	19m 49s
x86-64 Apple Darwin	31m 20s
x86-64 Linux musl	21m 20s
x86-64 Windows MSVC	36m 27s
use dtrace	19m 59s
use pool_memalign	21m 52s
	6h 27m 6s

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