fix(sns): testflight should set post-execution variables #21454

Job	Run time
Bazel Test All	12m 24s
Bazel Build Fuzzers	2m 14s
Bazel Test macOS Intel	0s
Bazel Build All Config Check	0s
Bazel Build Fuzzers AFL	3m 57s
Build IC	16m 31s
Python CI Tests	1m 27s
Cargo Build Release Linux	7m 38s
Cargo Clippy Linux	3m 58s
Build Determinism (//publish/binaries:upload, release, build-ic/release, false)	17s
Build Determinism (//publish/canisters:upload, canisters, build-ic/canisters, false)	17s
Build Determinism (//ic-os/guestos/envs/prod:upload_disk-img, guest-os/update-img, build-ic/icos/...	16s
Build Determinism (//ic-os/hostos/envs/prod:upload_update-img, host-os/update-img, build-ic/icos/...	18s
Build Determinism (//ic-os/setupos/envs/prod:upload_disk-img, setup-os/disk-img, build-ic/icos/se...	20s
	49m 37s

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