ci: drop mount-path for devnet verify build

[dev-jodee]

Summary

• Remove mount-path: program from the devnet verify-build step.

Root Cause

solana-verify expects a Cargo.lock at the directory it mounts/builds. With mount-path: program it looked for program/Cargo.lock, which does not exist — the workspace Cargo.lock lives at the repo root. Pre-flight failed with:

Mount directory must contain a Cargo.lock file
Error: Error verifying program: Missing Cargo.lock file at
'/tmp/solana-verify/<id>/subscriptions/program/Cargo.lock'

Dropping mount-path lets solana-verify use the repo root and resolve the program via --library-name subscriptions, matching how the earlier Build verified program step invokes solana-verify.

Test Plan

• Trigger Release workflow against devnet from this branch.
• Confirm Verify build (devnet) clears pre-flight, builds, and writes the verification PDA.

Failing run for reference: https://github.com/solana-program/subscriptions/actions/runs/25183322572

[github-actions]

Compute Unit Report

Instruction	Samples	Min CUs	Max CUs	Avg CUs	Est Cost (Low) [SOL]	Est Cost (Med) [SOL]	Est Cost (High) [SOL]
cancel_subscription	11	1805	2118	2003	0.000005000	0.000005080	0.000006001
close_subscription_authority	7	1881	1916	1886	0.000005000	0.000005075	0.000005943
create_fixed_delegation	38	3621	12647	5229	0.000005001	0.000005209	0.000007614
create_plan	84	3540	15553	5471	0.000005001	0.000005218	0.000007735
create_recurring_delegation	27	3640	11173	5535	0.000005001	0.000005221	0.000007767
delete_plan	8	416	416	416	0.000005000	0.000005016	0.000005208
init_subscription_authority	142	8931	18351	11878	0.000005003	0.000005475	0.000010939
revoke_delegation	19	318	585	420	0.000005000	0.000005016	0.000005210
subscribe	21	6666	18690	8890	0.000005002	0.000005355	0.000009445
transfer_fixed	6	10105	11605	11104	0.000005003	0.000005444	0.000010552
transfer_recurring	17	10212	16212	11743	0.000005003	0.000005469	0.000010871
transfer_subscription	10	10495	17946	12000	0.000005003	0.000005480	0.000011000
update_plan	21	424	500	474	0.000005000	0.000005018	0.000005237

Generated: 2026-04-30