feat: add workspace agent APIVersion (#10419)

Fixes #10339

codersdk/deployment_test.go

@@ -218,7 +218,7 @@ func TestTimezoneOffsets(t *testing.T) {
 		//	Name:           "Eastern",
 		//	Loc:            must(time.LoadLocation("America/New_York")),
 		//	ExpectedOffset: -4,
-		//},
+		// },
 		//{
 		//	Name:           "Central",
 		//	Loc:            must(time.LoadLocation("America/Chicago")),

codersdk/workspaceagents.go

@@ -166,6 +166,7 @@ type WorkspaceAgent struct {
 	Directory            string                  `json:"directory,omitempty"`
 	ExpandedDirectory    string                  `json:"expanded_directory,omitempty"`
 	Version              string                  `json:"version"`
+	APIVersion           string                  `json:"api_version"`
 	Apps                 []WorkspaceApp          `json:"apps"`
 	// DERPLatency is mapped by region name (e.g. "New York City", "Seattle").
 	DERPLatency              map[string]DERPRegion     `json:"latency,omitempty"`