Reject invalid legacy release selectors

scripts/release

@@ -1,10 +1,16 @@
 #!/bin/sh
 set -eu
 
-if [ "$#" -ne 2 ]; then
+usage() {
     printf '%s\n' 'usage: ./scripts/release MODULE VERSION' >&2
     exit 2
-fi
+}
+
+[ "$#" -eq 2 ] || usage
+case "$1" in
+    core|ckconfig|ckprompt) ;;
+    *) usage ;;
+esac
 
 script_dir=$(CDPATH= cd "$(dirname "$0")" && pwd)
 exec "$script_dir/releasekit" "$1" publish "$2"

scripts/release_test.go

@@ -187,7 +187,19 @@ func TestInvalidForms(t *testing.T) {
 	for _, tc := range []struct {
 		script string
 		args   []string
-	}{{"releasekit", nil}, {"releasekit", []string{"unknown"}}, {"releasekit", []string{"core"}}, {"releasekit", []string{"core", "version"}}, {"release", nil}, {"release", []string{"core"}}, {"release", []string{"core", "v1", "extra"}}, {"release", []string{"unknown", "v1"}}} {
+	}{
+		{"releasekit", nil},
+		{"releasekit", []string{"unknown"}},
+		{"releasekit", []string{"core"}},
+		{"releasekit", []string{"core", "version"}},
+		{"release", nil},
+		{"release", []string{"core"}},
+		{"release", []string{"core", "v1", "extra"}},
+		{"release", []string{"unknown", "v1"}},
+		{"release", []string{"version", "v1.2.3"}},
+		{"release", []string{"publication-attempts", "v1.2.3"}},
+		{"release", []string{"reconcile", "v1.2.3"}},
+	} {
 		f := newFixture(t)
 		_, stderr, status := f.run(t, tc.script, 0, tc.args...)
 		if status != 2 || !strings.Contains(stderr, "usage:") {