Add script to lint integration test

The integration test crate is not part of the workspace and also cannot
be built wit all features so linting it must be done for each feature.

Add a script that runs the linter.

Author: tcharding

contrib/lint-integtation-tests.sh

@@ -0,0 +1,26 @@
+#!/usr/bin/env bash
+#
+# The `integration_test` crate is not part of the workspace and cannot be built
+# with `--all-features`.
+
+set -euox pipefail
+
+REPO_DIR=$(git rev-parse --show-toplevel)
+
+# Run clippy for each feature starting with an integer i.e., all
+# the 'public' features.
+function main() {
+    pushd "$REPO_DIR/integration_test" > /dev/null
+
+    # Extract features that start with digits from the manifest.
+    features=$(grep -E '^[0-9]' Cargo.toml | grep '=' | cut -d' ' -f1)
+
+    for feature in $features; do
+        cargo +"$(cat ../nightly-version)" clippy --all-targets --features="$feature" -- -D warnings
+    done
+
+    popd
+}
+
+main "$@"
+exit 0