ci: harden unix installer smoke server startup

Detect python command, randomize test port, and wait for readiness before invoking one-liner installer to avoid flaky connection failures.

Author: leehack

.github/workflows/installer-smoke.yml

@@ -93,13 +93,37 @@ jobs:
         shell: bash
         run: |
           set -euo pipefail
-          port=18080
+          port=$((RANDOM % 1000 + 18080))
           serve_root="$RUNNER_TEMP/serve"
 
-          python3 -m http.server "$port" --directory "$serve_root" >"$RUNNER_TEMP/http.log" 2>&1 &
+          if command -v python3 >/dev/null 2>&1; then
+            python_cmd="python3"
+          elif command -v python >/dev/null 2>&1; then
+            python_cmd="python"
+          else
+            echo "Python is required for installer smoke tests." >&2
+            exit 1
+          fi
+
+          "$python_cmd" -m http.server "$port" --directory "$serve_root" >"$RUNNER_TEMP/http.log" 2>&1 &
           server_pid=$!
           trap 'kill "$server_pid"' EXIT INT TERM
-          sleep 2
+
+          ready=0
+          for _ in $(seq 1 30); do
+            if curl -fsS "http://127.0.0.1:${port}/tool/install.sh" >/dev/null 2>&1; then
+              ready=1
+              break
+            fi
+            sleep 1
+          done
+          if [ "$ready" -ne 1 ]; then
+            echo "Local HTTP server did not become ready on port ${port}." >&2
+            if [ -f "$RUNNER_TEMP/http.log" ]; then
+              cat "$RUNNER_TEMP/http.log"
+            fi
+            exit 1
+          fi
 
           curl -fsSL "http://127.0.0.1:${port}/tool/install.sh" | \
             DRX_REPO=example/drx \