Create dependabot.yml

有鉴于 [v2fly/fhs-install-v2ray](https://github.com/v2fly/fhs-install-v2ray) 极可能会成为未来官方钦定的一种 dat 文件更新标准，最近在 build.yml 上所做的更改是值得商榷的。
我的建议是该 fork 不应该与上游的行为不同，否则如果用户替换 v2fly 的 dat-install 脚本中更新源地址就会遇到问题。

.github/dependabot.yml

@@ -0,0 +1,25 @@
+# To get started with Dependabot version updates, you'll need to specify which
+# package ecosystems to update and where the package manifests are located.
+# Please see the documentation for all configuration options:
+# https://help.github.com/github/administering-a-repository/configuration-options-for-dependency-updates
+
+version: 2
+updates:
+
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "daily"
+      timezone: "Asia/Shanghai"
+      time: "07:00"
+    pull-request-branch-name:
+      separator: "-"
+
+  - package-ecosystem: "gomod"
+    directory: "/"
+    schedule:
+      interval: "daily"
+      timezone: "Asia/Shanghai"
+      time: "07:00"
+    pull-request-branch-name:
+      separator: "-"

.github/workflows/build.yml

@@ -145,7 +145,9 @@ jobs:
           install -p $GOPATH/src/$GEOSITE_REPO/data/{proxy,direct,reject}-list.txt ./publish/
           cd ./publish
           zip rules.zip {proxy,direct,reject}-list.txt geoip.dat geosite.dat
-          sha256sum geoip.dat geosite.dat rules.zip > sha256sum
+          sha256sum geoip.dat > geoip.dat.sha256sum
+          sha256sum geosite.dat > geosite.dat.sha256sum
+          sha256sum rules.zip > rules.zip.sha256sum
 
       - name: Release and upload assets
         uses: softprops/action-gh-release@v1