Build

[Docs] Document `dstack offer` #4417

Job	Run time
frontend-build	7s
gateway-build	12s
docs-build	1m 14s
python-lint	17s
runner-test	53s
python-test (macos-latest, 3.9)	1m 10s
python-test (macos-latest, 3.10)	1m 7s
python-test (macos-latest, 3.11)	1m 0s
python-test (macos-latest, 3.12)	1m 14s
python-test (macos-latest, 3.13)	1m 6s
python-test (ubuntu-latest, 3.9)	3m 5s
python-test (ubuntu-latest, 3.10)	2m 47s
python-test (ubuntu-latest, 3.11)	2m 51s
python-test (ubuntu-latest, 3.12)	2m 47s
python-test (ubuntu-latest, 3.13)	2m 49s
python-test (windows-latest, 3.9)	1m 6s
python-test (windows-latest, 3.10)	1m 3s
python-test (windows-latest, 3.11)	1m 8s
python-test (windows-latest, 3.12)	1m 18s
python-test (windows-latest, 3.13)	1m 14s
runner-compile (linux, amd64, ubuntu-latest)	26s
runner-upload	14s
generate-json-schema	20s
update-get-dstack	7s
	29m 35s

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