ci(checks): scope gha sccache to rust #1644

Job	Run time
Resolve PR metadata	6s
build-supervisor / Resolve build plan	4s
build-gateway / Resolve build plan	5s
build-supervisor / Rust sandbox (arm64) / sandbox (arm64)	3m 35s
build-gateway / Rust gateway (arm64) / gateway (arm64)	7m 38s
build-supervisor / Build supervisor (arm64)	2m 4s
build-supervisor / Merge ${{ inputs.component }} manifest	0s
build-gateway / Build gateway (arm64)	2m 9s
e2e / E2E (python)	7m 16s
build-gateway / Merge ${{ inputs.component }} manifest	0s
e2e / E2E (rust-docker)	7m 41s
e2e / E2E (rust-podman)	10m 42s
	41m 20s

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