Fix SIGPIPE race in go.mod Go-version parsing

[defangdevs]

Summary

• The "Update Homebrew Formula" workflow started failing on run 32432417340 (and again on rerun) at the "Determine required Go version from go.mod" step, with curl exiting 23 ("failed writing received data").
• Root cause: curl -fsSL "$GO_MOD_URL" | awk '/^go [0-9]/{print $2; exit}' — the go X.Y line sits near the top of go.mod, so awk matches almost immediately and its exit closes the pipe's read end while curl may still be writing the rest of the (now larger, dependency-heavy) response body. That's a SIGPIPE race: curl gets a write error and returns 23, which set -o pipefail turns into a step failure. This explains why it worked for months and only recently started failing — go.mod grew enough that curl now issues multiple writes, widening the race window.
• Fix: capture curl's full output into a variable first, then run awk over it. This removes the pipe entirely so parsing never races the download.

Test plan

• Ran the fixed snippet locally against the real URL (v3.14.0/src/go.mod) — correctly resolves GO_FULL=1.25.9.
• Confirm the workflow succeeds end-to-end on a real repository_dispatch (or manual workflow_dispatch) run after merge.

🤖 Generated with Claude Code

[coderabbitai]

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Run ID: 4033e2c1-8bdb-43ad-9868-68940bb8c298

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[defangdevs]

Note: because both automatic attempts for v3.14.0 failed (this bug), the formula is still pinned to v3.13.0 / go@1.24. workflow_dispatch fetches the latest release regardless of trigger, so after merging this fix, please run the workflow manually once (Actions → Update Homebrew Formula → Run workflow) to pick up v3.14.0 — it won't retry on its own since the repository_dispatch event already fired.