[pre-commit]Add shared kuttl pre-commit rules

This pre-commit check ensures that no TestAsserts are defined in
our kuttl tests that are ignores by kuttl

.pre-commit-hooks.yaml

@@ -0,0 +1,6 @@
+    - id: kuttl-single-test-assert
+      name: kuttl-single-test-assert
+      language: script
+      pass_filenames: false
+      entry: pre-commit-hooks/kuttl-single-test-assert.sh
+

pre-commit-hooks/kuttl-single-test-assert.sh

@@ -0,0 +1,14 @@
+#!/bin/bash
+set -euxo pipefail
+
+# Ensure that there are no assert files with more than one TestAssert
+# as the extra TestAsserts are silently ignored by kuttl
+KUTTL_DIR=${1:-"./test/kuttl"}
+! egrep -c --include='*.y*ml' -R -e 'kind: TestAssert' "$KUTTL_DIR" \
+        | grep -v ':0' | grep -v ':1'
+ret=$?
+if [ $ret -ne 0 ]; then
+    echo Kuttl only executes the last TestAssert in an assert file.
+    echo Combine the TestAsserts into a single one with a list of commands.
+fi
+exit $ret