Squashed 'release-tools/' changes from 3b6d17b1..1d60e779

1d60e779 Merge pull request #131 from pohly/kubernetes-1.20-tag
9f104590 prow.sh: support building Kubernetes for a specific version
fe1f2848 Merge pull request #121 from kvaps/namespace-check
8fdf0f78 Merge pull request #128 from fengzixu/master
1c94220d fix: fix a bug of csi-sanity
a4c41e6a Merge pull request #127 from pohly/fix-boilerplate
ece0f500 check namespace for snapshot-controller
dbd89672 verify-boilerplate.sh: fix path to script
9289fd16 Merge pull request #125 from sachinkumarsingh092/optional-spelling-boilerplate-checks
ad29307f Make the spelling and boilerplate checks optional
5f06d024 Merge pull request #124 from sachinkumarsingh092/fix-spellcheck-boilerplate-tests
48186eba Fix spelling and boilerplate errors
71690aff Merge pull request #122 from sachinkumarsingh092/include-spellcheck-boilerplate-tests
981be3fe Adding spelling and boilerplate checks.
2bb75253 Merge pull request #117 from fengzixu/master
4ab8b154 use the tag to replace commit of csi-test
5d74e455 change the csi-test import path to v4
7dcd0a99 upgrade csi-test to v4.0.2

git-subtree-dir: release-tools
git-subtree-split: 1d60e7792624a9938c0bd1b045211fbb89e513d6

build.make

@@ -275,3 +275,16 @@ test-shellcheck:
 .PHONY: check-go-version-%
 check-go-version-%:
 	./release-tools/verify-go-version.sh "$*"
+
+# Test for spelling errors.
+.PHONY: test-spelling
+test-spelling:
+	@ echo; echo "### $@:"
+	@ ./release-tools/verify-spelling.sh "$(pwd)"
+
+# Test the boilerplates of the files.
+.PHONY: test-boilerplate
+test-boilerplate:
+	@ echo; echo "### $@:"
+	@ ./release-tools/verify-boilerplate.sh "$(pwd)"
+