Feat/version manifests (#387)

Signed-off-by: Fabian Kammel <fk@edgeless.systems>
Co-authored-by: Otto Bittner <cobittner@posteo.net>

hack/build-manifest/gcp/options_test.go

@@ -0,0 +1,38 @@
+package gcp
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestIsGcpReleaseImage(t *testing.T) {
+	testCases := map[string]struct {
+		image       string
+		wantVersion string
+		wantError   bool
+	}{
+		"works for release image": {
+			image:       "projects/constellation-images/global/images/constellation-v1-3-0",
+			wantVersion: "v1.3.0",
+		},
+		"breaks for debug image": {
+			image:     "projects/constellation-images/global/images/constellation-20220805151600",
+			wantError: true,
+		},
+	}
+
+	for name, tc := range testCases {
+		t.Run(name, func(t *testing.T) {
+			assert := assert.New(t)
+
+			version, err := isGcpReleaseImage(tc.image)
+			if tc.wantError {
+				assert.Error(err)
+				return
+			}
+			assert.NoError(err)
+			assert.Equal(tc.wantVersion, version)
+		})
+	}
+}