[release] Add 3.1.5 release (#894)

diff --git a/config/download.json b/config/download.json
index 6a52049..d5acf9b 100644
--- a/config/download.json
+++ b/config/download.json
@@ -1,4 +1,17 @@
 {
+  "3.1.5": {
+    "time": "2023-4-6",
+    "src": {
+      "src": "https://www.apache.org/dyn/closer.lua/dolphinscheduler/3.1.5/apache-dolphinscheduler-3.1.5-src.tar.gz",
+      "asc": "https://downloads.apache.org/dolphinscheduler/3.1.5/apache-dolphinscheduler-3.1.5-src.tar.gz.asc",
+      "sha512": "https://downloads.apache.org/dolphinscheduler/3.1.5/apache-dolphinscheduler-3.1.5-src.tar.gz.sha512"
+    },
+    "bin": {
+      "src": "https://www.apache.org/dyn/closer.lua/dolphinscheduler/3.1.5/apache-dolphinscheduler-3.1.5-bin.tar.gz",
+      "asc": "https://downloads.apache.org/dolphinscheduler/3.1.5/apache-dolphinscheduler-3.1.5-bin.tar.gz.asc",
+      "sha512": "https://downloads.apache.org/dolphinscheduler/3.1.5/apache-dolphinscheduler-3.1.5-bin.tar.gz.sha512"
+    }
+  },
   "3.1.4": {
     "time": "2023-02-24",
     "src": {
diff --git a/scripts/conf.sh b/scripts/conf.sh
index e23b689..b2a8fcc 100644
--- a/scripts/conf.sh
+++ b/scripts/conf.sh
@@ -60,4 +60,5 @@
   "3.1.2:3.1.2-release"
   "3.1.3:3.1.3-release"
   "3.1.4:3.1.4-release"
+  "3.1.5:3.1.5-release"
 )