fix: zap-time-encoding test should allow negative tz offset

The regex used to test whether the times were being properly encoded as
ISO8601 only permitted either positive tz offsets or Z. This fix adjusts
the regex to also allow negative offsets.

Signed-off-by: John Strunk <jstrunk@redhat.com>

pkg/log/zap/zap_test.go

@@ -528,7 +528,7 @@ var _ = Describe("Zap log level flag options setup", func() {
 
 		It("Should propagate time encoder to logger", func() {
 			// zaps ISO8601TimeEncoder uses 2006-01-02T15:04:05.000Z0700 as pattern for iso8601 encoding
-			iso8601Pattern := `^[0-9]{4}-[0-9]{2}-[0-9]{2}T[0-9]{2}:[0-9]{2}:[0-9]{2}.[0-9]{3}(\+[0-9]{4}|Z)`
+			iso8601Pattern := `^[0-9]{4}-[0-9]{2}-[0-9]{2}T[0-9]{2}:[0-9]{2}:[0-9]{2}.[0-9]{3}([-+][0-9]{4}|Z)`
 
 			args := []string{"--zap-time-encoding=iso8601"}
 			fromFlags.BindFlags(&fs)