feat(gitops): introduce workflows view [BE-12807] (#2391) (#2428)

Co-authored-by: Chaim Lev-Ari <chiptus@users.noreply.github.com>
Co-authored-by: Chaim Lev-Ari <chaim.lev-ari@portainer.io>

api/http/handler/gitops/workflows/handler.go

@@ -0,0 +1,36 @@
+package workflows
+
+import (
+	"net/http"
+	"time"
+
+	gocache "github.com/patrickmn/go-cache"
+	"github.com/portainer/portainer/api/dataservices"
+	httperror "github.com/portainer/portainer/pkg/libhttp/error"
+
+	"github.com/gorilla/mux"
+)
+
+const (
+	cacheTTL             = 30 * time.Second
+	cacheCleanupInterval = 10 * time.Minute
+)
+
+type Handler struct {
+	*mux.Router
+	dataStore dataservices.DataStore
+	cache     *gocache.Cache
+}
+
+func NewHandler(dataStore dataservices.DataStore) *Handler {
+	h := &Handler{
+		Router:    mux.NewRouter(),
+		dataStore: dataStore,
+		cache:     gocache.New(cacheTTL, cacheCleanupInterval),
+	}
+
+	h.Handle("/gitops/workflows", httperror.LoggerHandler(h.list)).Methods(http.MethodGet)
+	h.Handle("/gitops/workflows/summary", httperror.LoggerHandler(h.summary)).Methods(http.MethodGet)
+
+	return h
+}