[ci] port Buildkite Ray Images to Wanda

[andrew-anyscale]

Updates buildkite steps to use Wanda+Dockerfile, including both build and upload steps.
For now, missing parity on uploading pip-freeze to Buildkite Artifacts. To be done in subsequent Wanda feature

Topic: wanda-image-upload
Relative: multiplat-support
Signed-off-by: andrew andrew@anyscale.com

[andrew-anyscale]

Reviews in this chain:
└#60455 [ci] port Buildkite Ray Images to Wanda
　├#59937 [ci] Add wanda anyscale image builds for release tests
　└#60539 Consolidate RAY_VERSION to use rayci.env as single source of truth

[andrew-anyscale]

#	head	base	diff	date	summary
0	3a35fdb6	9d5c113a	diff	Jan 23 8:54 AM	2 files changed, 476 insertions(+), 79 deletions(-)
1	1d0a962d	7d33f916	diff	Jan 26 9:02 AM	1 file changed, 7 insertions(+)
2	1960a8e6	8808ad90	diff	Jan 27 9:45 AM	3 files changed, 11 insertions(+), 10 deletions(-)
3	6cfc4e79	3813b4f8	diff	Jan 27 9:48 AM	0 files changed
4	d1a8111b	3813b4f8	diff	Jan 27 9:50 AM	1 file changed, 1 insertion(+)
5	a4fe1e01	c9b78801	diff	Jan 27 13:56 PM	0 files changed
6	8ed4a6d1	23402617	diff	Jan 29 16:22 PM	1 file changed, 8 insertions(+)
7	2d70aa81	17c6070f	diff	Jan 29 16:45 PM	1 file changed, 1 insertion(+), 1 deletion(-)
8	869f34fb	17c6070f	diff	Jan 29 16:47 PM	1 file changed, 1 insertion(+)
9	536ab35d	17c6070f	diff	Jan 29 17:00 PM	1 file changed, 1 insertion(+)
10	2abbbc5e	17c6070f	diff	Jan 29 17:51 PM	2 files changed, 1 insertion(+), 2 deletions(-)
11	45cd1ae4	dcfc8098	diff	Jan 29 18:33 PM	0 files changed
12	6ed02db2	d0e66729	rebase	Jan 29 21:00 PM	0 files changed
13	e4774330	53801907	rebase	Jan 29 21:03 PM	0 files changed
14	ad559443	53801907	diff	Jan 29 21:20 PM	1 file changed, 1 insertion(+), 1 deletion(-)
15	c663c716	f3f1afc3	diff	Jan 30 8:58 AM	4 files changed, 298 insertions(+), 181 deletions(-)
16	5af6a2b9	22702c04	rebase	Jan 30 9:07 AM	0 files changed
17	907e1ec1	68188ccb	diff	Jan 30 10:19 AM	2 files changed, 6 insertions(+), 18 deletions(-)
18	f2086dc7	68188ccb	diff	Jan 30 10:41 AM	1 file changed, 3 insertions(+), 1 deletion(-)
19	b66d7595	7452f4cf	rebase	Jan 30 10:46 AM	0 files changed
20	2fb5892f	54061a8c	diff	Jan 30 10:58 AM	0 files changed
21	efba4b0f	9fc08d89	rebase	Jan 30 10:59 AM	0 files changed
22	cba45eb4	aa87d9de	rebase	Jan 30 12:22 PM	0 files changed
23	ba9c8603	c6a71b7e	diff	Jan 30 13:28 PM	2 files changed, 6 insertions(+)
24	fc730b06	86e7fb92	rebase	Jan 30 13:31 PM	0 files changed
25	1609eac2	aa0695a8	diff	Jan 30 13:58 PM	2 files changed, 6 insertions(+)
26	1609eac2	aa0695a8	diff	Jan 30 13:59 PM	0 files changed
27	7fe9ae2b	2b490725	rebase	Jan 30 14:21 PM	0 files changed
28	0ec84ea3	44aa52e6	rebase	Jan 30 15:13 PM	0 files changed
29	ea2ca724	3e40294d	diff	Jan 30 17:26 PM	0 files changed

[gemini-code-assist]

Code Review

This pull request refactors the Ray image build process in Buildkite to use Wanda. The changes separate the build and push steps for Docker images, which is a good improvement. The new Wanda-based build steps are defined in new .wanda.yaml files, and the Buildkite pipelines are updated to use them.

My review focuses on the maintainability of the Buildkite configuration files. I've noticed significant duplication of matrix definitions for Python and CUDA versions across different steps. I've suggested using YAML anchors to reduce this redundancy, which will make future updates to these versions much easier and less error-prone. Overall, the changes look good and are a positive step towards a more modular CI process.