msteams notifier: adaptive cards full width

Configure the adaptive card to expand and make full use of extra canvas
space in teams.

Signed-off-by: Valentin Flaux <38909103+vflaux@users.noreply.github.com>

internal/notifier/teams.go

@@ -84,6 +84,7 @@ type msAdaptiveCardContent struct {
 	Type    string                      `json:"type"`
 	Version string                      `json:"version"`
 	Body    []msAdaptiveCardBodyElement `json:"body"`
+	MSTeams msAdaptiveCardMSTeams       `json:"msteams"`
 }
 
 type msAdaptiveCardBodyElement struct {
@@ -98,6 +99,10 @@ type msAdaptiveCardContainer struct {
 	Items []msAdaptiveCardBodyElement `json:"items,omitempty"`
 }
 
+type msAdaptiveCardMSTeams struct {
+	Width string `json:"width,omitempty"`
+}
+
 type msAdaptiveCardTextBlock struct {
 	Text   string `json:"text,omitempty"`
 	Size   string `json:"size,omitempty"`
@@ -237,6 +242,9 @@ func buildMSTeamsAdaptiveCardPayload(event *eventv1.Event, objName string) *msAd
 					Schema:  "http://adaptivecards.io/schemas/adaptive-card.json",
 					Type:    "AdaptiveCard",
 					Version: msAdaptiveCardVersion,
+					MSTeams: msAdaptiveCardMSTeams{
+						Width: "Full",
+					},
 					Body: []msAdaptiveCardBodyElement{
 						{
 							Type: "Container",

internal/notifier/teams_test.go

@@ -100,6 +100,9 @@ func TestMSTeams_Post(t *testing.T) {
 						"$schema": "http://adaptivecards.io/schemas/adaptive-card.json",
 						"type":    "AdaptiveCard",
 						"version": "1.4",
+						"msteams": map[string]any{
+							"width": "Full",
+						},
 						"body": []any{
 							map[string]any{
 								"type": "Container",