Add org list (#2338)

![Screenshot 2023-08-28 at 10-08-20
Woodpecker](https://github.com/woodpecker-ci/woodpecker/assets/80460567/e3248b05-7899-43ca-a0cf-4834eae078d8)
Closes #2307

server/api/orgs.go

@@ -0,0 +1,72 @@
+// Copyright 2023 Woodpecker Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package api
+
+import (
+	"net/http"
+	"strconv"
+
+	"github.com/gin-gonic/gin"
+
+	"github.com/woodpecker-ci/woodpecker/server/router/middleware/session"
+	"github.com/woodpecker-ci/woodpecker/server/store"
+)
+
+// GetOrgs
+//
+//	@Summary		Get all orgs
+//	@Description	Returns all registered orgs in the system. Requires admin rights.
+//	@Router			/orgs [get]
+//	@Produce		json
+//	@Success		200	{array}	Org
+//	@Tags			Orgs
+//	@Param			Authorization	header	string	true	"Insert your personal access token"				default(Bearer <personal access token>)
+//	@Param			page			query	int		false	"for response pagination, page offset number"	default(1)
+//	@Param			perPage			query	int		false	"for response pagination, max items per page"	default(50)
+func GetOrgs(c *gin.Context) {
+	orgs, err := store.FromContext(c).OrgList(session.Pagination(c))
+	if err != nil {
+		c.String(500, "Error getting user list. %s", err)
+		return
+	}
+	c.JSON(200, orgs)
+}
+
+// DeleteOrg
+//
+//	@Summary		Delete an org
+//	@Description	Deletes the given org. Requires admin rights.
+//	@Router			/orgs/{id} [delete]
+//	@Produce		json
+//	@Success		204	{object}	Org
+//	@Tags			Orgs
+//	@Param			Authorization	header	string	true	"Insert your personal access token"	default(Bearer <personal access token>)
+//	@Param			id			path	string	true	"the org's id"
+func DeleteOrg(c *gin.Context) {
+	_store := store.FromContext(c)
+
+	orgID, err := strconv.ParseInt(c.Param("org_id"), 10, 64)
+	if err != nil {
+		c.String(http.StatusBadRequest, "Error parsing org id. %s", err)
+		return
+	}
+
+	err = _store.OrgDelete(orgID)
+	if err != nil {
+		c.String(http.StatusInternalServerError, "Error deleting org %d. %s", orgID, err)
+	}
+
+	c.String(http.StatusNoContent, "")
+}