Bump supported K8s version

The support policy of Weave GitOps is to "test Weave GitOps against
the latest supported Kubernetes releases" which means that only 1.26,
1.27 and 1.28 are supported at this point.

This change doesn't prevent Weave GitOps from being run on older
versions of Kubernetes as the constraint is only used by the
`gitops check` command which is purely informational.

Signed-off-by: Max Jonas Werner <mail@makk.es>

pkg/services/check/check.go

@@ -8,7 +8,7 @@ import (
 )
 
 const (
-	kubernetesConstraints = ">=1.20.6-0"
+	kubernetesConstraints = ">=1.26"
 )
 
 // KubernetesVersion checks if the Kubernetes version of the client is recent enough and
@@ -30,5 +30,5 @@ func KubernetesVersion(c discovery.DiscoveryInterface) (string, error) {
 		return "", fmt.Errorf("✗ kubernetes version %s does not match %s", sv.Original(), kubernetesConstraints)
 	}
 
-	return fmt.Sprintf("✔ Kubernetes %s %s", sv.String(), kubernetesConstraints), nil
+	return fmt.Sprintf("✔ Kubernetes %s %s", sv, kubernetesConstraints), nil
 }

pkg/services/check/check_test.go

@@ -39,12 +39,12 @@ func TestKubernetesVersion(t *testing.T) {
 		{
 			name:          "server version satisfies constraint",
 			serverVersion: "v1.28.4",
-			expectedRes:   `✔ Kubernetes 1.28.4 >=1.20.6-0`,
+			expectedRes:   `^✔ Kubernetes 1.28.4 >=1.`,
 		},
 		{
 			name:          "server version too low",
 			serverVersion: "v1.20.5",
-			expectedErr:   `✗ kubernetes version v1\.20\.5 does not match >=1\.20\.6-0`,
+			expectedErr:   `✗ kubernetes version v1\.20\.5 does not match >=1\.`,
 		},
 		{
 			name:          "server version not semver compliant",
@@ -72,7 +72,7 @@ func TestKubernetesVersion(t *testing.T) {
 				g.Expect(err).To(MatchError(MatchRegexp(tt.expectedErr)))
 			}
 
-			g.Expect(res).To(Equal(tt.expectedRes))
+			g.Expect(res).To(MatchRegexp(tt.expectedRes))
 		})
 	}
 }