Add help script to easily run all integration tests

ci/integration-tests.sh

@@ -0,0 +1,19 @@
+#!/usr/bin/env bash
+#
+# Runs all integration tests in the tree serially
+#
+set -e
+FEATURES="$1"
+cd "$(dirname "$0")/.."
+source ci/_
+export RUST_BACKTRACE=1
+
+for test in {,*/}tests/*.rs; do
+  test=${test##*/} # basename x
+  test=${test%.rs} # basename x .rs
+  (
+    export RUST_LOG="$test"=trace,$RUST_LOG
+    _ cargo test --all --verbose --features="$FEATURES" --test="$test" \
+      -- --test-threads=1 --nocapture
+  )
+done