feat: support forward to multiple slack workspace

example.config.json

@@ -19,8 +19,17 @@
         "botGravatarMail": "bot+%s@example.com",
         "humanGravatarMail": "%s@example.com",
         "joinChannels": [
-            {"name": "#general", "id":  "<slack channel id>"}
-        ]
+            "#general"
+        ],
+        "forwards": {
+            "subchannel": {
+                "token": "",
+                "forwardChannels": {
+                    "source": "#general_child",
+                    "target": "#general"
+                }
+            }
+        }
     },
     "ldap": {
         "url": "ldap://example.com:389",

go.mod

@@ -1,15 +1,15 @@
 module channels
 
-go 1.14
+go 1.16
 
 require (
-	github.com/getsentry/sentry-go v0.6.1
-	github.com/gin-gonic/gin v1.6.3
-	github.com/go-ldap/ldap/v3 v3.2.1
-	github.com/go-redis/redis/v7 v7.4.0
-	github.com/prometheus/alertmanager v0.21.0
-	github.com/sirupsen/logrus v1.6.0
-	github.com/slack-go/slack v0.8.1
-	github.com/spf13/cobra v1.0.0
-	github.com/stretchr/testify v1.6.1
+	github.com/getsentry/sentry-go v0.11.0
+	github.com/gin-gonic/gin v1.7.4
+	github.com/go-ldap/ldap/v3 v3.4.1
+	github.com/go-redis/redis/v7 v7.4.1
+	github.com/prometheus/alertmanager v0.22.2
+	github.com/sirupsen/logrus v1.8.1
+	github.com/slack-go/slack v0.9.4
+	github.com/spf13/cobra v1.2.1
+	github.com/stretchr/testify v1.7.0
 )