[Docs] Add dstack skill #6315

Job	Run time
compute-version	3s
build-docs / build-docs	1m 11s
build-artifacts / code-lint	43s
build-artifacts / gateway-build	15s
build-artifacts / frontend-build	10s
build-artifacts / runner-test (macos-latest)	44s
build-artifacts / runner-test (ubuntu-latest)	57s
build-artifacts / generate-json-schema	0s
build-artifacts / python-build	0s
build-artifacts / python-test	0s
build-artifacts / runner-compile (ubuntu-24.04-arm, linux, arm64)	31s
build-artifacts / runner-compile (ubuntu-24.04, linux, amd64)	38s
upload-pre-pypi-artifacts	0s
upload-post-pypi-artifacts	0s
	5m 12s

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