Read CI env from Infisical and give the local stack its own ports

CI reads Infisical staging as the read-only convexmonorepo-base-ci machine identity, runs the quality gate, and builds and pushes the image. The template is not deployed, so there is no Convex or VPS deploy step. The local stack moves to its own Compose name and ports so it runs beside the Payload template's, and it syncs the Convex runtime env. The scripts pick up Infisical account switching, dev-kill and a cache-safe CI install.

scripts/ci-install

@@ -0,0 +1,14 @@
+#!/usr/bin/env bash
+# Install on a runner, and survive a half-written cache entry.
+#
+# Runners have failed twice with "Fail extracting tarball" on a different
+# package each time, on different machines, and passed on a re-run. The cache
+# is shared between jobs on a host, so a job that dies mid-write leaves an
+# entry the next job cannot read. Clearing it and installing again costs a
+# couple of minutes; a human re-running the job costs however long it takes
+# someone to notice.
+set -euo pipefail
+if bun install --frozen-lockfile; then exit 0; fi
+echo "Install failed. Clearing the bun cache and trying once more." >&2
+rm -rf "${BUN_INSTALL_CACHE_DIR:-$HOME/.bun/install/cache}"
+bun install --frozen-lockfile