WEB-11460: Fix ssm.mk shell call under GNU Make 3.81

[lewissmithweb]

Summary

Hotfix for a parse error in ssm.mk (shipped in v1.16.0). The SSM_REPO_NAME derivation used # as the sed delimiter inside $(shell ...). GNU Make 3.81 — the macOS default — mis-tokenises that # as a comment when the expression is expanded, aborting with *** unterminated call to function 'shell': missing ')'.

It only surfaced for consumers that don't set SSM_SERVICE (so the derivation actually runs) — e.g. showcase, which hit it on make ssm_sync_test. Every test in the harness pinned SSM_SERVICE, which short-circuits line 14's ?= and skips the expansion, so the bug slipped through.

Changes

• ssm.mk: switch the sed delimiter from # to , so no # appears inside the $(shell ...) call. Behaviour is identical.
• test/ssm.sh: add a regression check that renders a target without pinning SSM_SERVICE, exercising the $(shell ...) derivation path. Verified it fails on the old code and passes on the fix.

How to test

• ./test/ssm.sh — green (also in CI).
• Reproduce the original: with the pre-fix line 13, make ssm_sync_test in a repo that doesn't set SSM_SERVICE aborts with the unterminated-function error; with the fix it renders /ecs/<env>/<repo>/….

Deployment notes

Needs a v1.16.1 release published after merge so the floating v1 tag advances and consumers pick up the fix on their next make init.

Closes WEB-11460

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📥 Commits

Reviewing files that changed from the base of the PR and between 3563d24 and 514a559.

📒 Files selected for processing (2)

• ssm.mk
• test/ssm.sh

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