Add: docker & gh-actions to dependabot

.github/dependabot.yml

@@ -1,3 +1,5 @@
+# Docs: <https://docs.github.com/en/free-pro-team@latest/github/administering-a-repository/customizing-dependency-updates>
+
 version: 2
 updates:
 - package-ecosystem: gomod
@@ -6,3 +8,17 @@ updates:
     interval: daily
     time: "04:00"
   open-pull-requests-limit: 10
+
+- package-ecosystem: docker
+  directory: "/"
+  schedule:
+    interval: daily
+    time: "04:00"
+  open-pull-requests-limit: 10
+
+- package-ecosystem: github-actions
+  directory: "/"
+  schedule:
+    interval: daily
+    time: "04:00"
+  open-pull-requests-limit: 10