build(deps): bump docker/build-push-action from 6.17.0 to 6.18.0 in the docker-github-actions group #390

Job	Run time
Build NGINX OSS image	22s
Test NGINX OSS image (virtual-v2)	1m 33s
Test NGINX OSS image (virtual)	1m 22s
Build NGINX OSS image using latest njs commit	1m 18s
Build NGINX OSS unprivileged image	25s
Test NGINX OSS unprivileged image	1m 25s
Test NGINX OSS image using latest njs commit	1m 19s
Tag and push all built and tested NGINX images	0s
	7m 44s

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