feat: inherit field for release template inheritance (#606)

* feat: `inherit` field for release template inheritance

Ref https://github.com/helmfile/helmfile/issues/435#issuecomment-1364749414

Signed-off-by: Yusuke Kuoka <ykuoka@gmail.com>

* Fix wording

Signed-off-by: Yusuke Kuoka <ykuoka@gmail.com>

* Comment on releaseWithInheritedTemplate

Signed-off-by: Yusuke Kuoka <ykuoka@gmail.com>

* Update Release Template doc with the new `inherit` feature

Signed-off-by: Yusuke Kuoka <ykuoka@gmail.com>

* Fix a typo in code comment

Signed-off-by: Yusuke Kuoka <ykuoka@gmail.com>

Signed-off-by: Yusuke Kuoka <ykuoka@gmail.com>

pkg/state/temp_test.go

@@ -38,39 +38,39 @@ func TestGenerateID(t *testing.T) {
 	run(testcase{
 		subject: "baseline",
 		release: ReleaseSpec{Name: "foo", Chart: "incubator/raw"},
-		want:    "foo-values-8496665478",
+		want:    "foo-values-648b77cdd4",
 	})
 
 	run(testcase{
 		subject: "different bytes content",
 		release: ReleaseSpec{Name: "foo", Chart: "incubator/raw"},
 		data:    []byte(`{"k":"v"}`),
-		want:    "foo-values-5c4468ff65",
+		want:    "foo-values-5dfbf8fdb7",
 	})
 
 	run(testcase{
 		subject: "different map content",
 		release: ReleaseSpec{Name: "foo", Chart: "incubator/raw"},
 		data:    map[string]interface{}{"k": "v"},
-		want:    "foo-values-7b656f7c67",
+		want:    "foo-values-7565d47dd9",
 	})
 
 	run(testcase{
 		subject: "different chart",
 		release: ReleaseSpec{Name: "foo", Chart: "stable/envoy"},
-		want:    "foo-values-675b4dffc9",
+		want:    "foo-values-7c4f76c445",
 	})
 
 	run(testcase{
 		subject: "different name",
 		release: ReleaseSpec{Name: "bar", Chart: "incubator/raw"},
-		want:    "bar-values-5fb8b9599",
+		want:    "bar-values-644fb47865",
 	})
 
 	run(testcase{
 		subject: "specific ns",
 		release: ReleaseSpec{Name: "foo", Chart: "incubator/raw", Namespace: "myns"},
-		want:    "myns-foo-values-64948d6f45",
+		want:    "myns-foo-values-c5ddcc795",
 	})
 
 	for id, n := range ids {