update PR template and enable dependabot for ecs-agent module

.github/PULL_REQUEST_TEMPLATE.md

@@ -35,6 +35,9 @@ You can see our changelog entry style here:
 https://github.com/aws/amazon-ecs-agent/commit/c9aefebc2b3007f09468f651f6308136bd7b384f
 -->
 
+**Does this PR include breaking model changes? If so, Have you added transformation functions?**
+<!-- If yes, next release should have a upgraded minor version -->  
+
 ### Licensing
 
 By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

.github/dependabot.yml

@@ -12,3 +12,15 @@ updates:
     # the bot stuck at trying to upgrade it; (2) sdk change has higher risk of breaking the agent so probably safer to
     # upgrade manually.
     - dependency-name: "github.com/aws/aws-sdk-go"
+- package-ecosystem: gomod
+  directory: "/ecs-agent"
+  schedule:
+    interval: weekly
+    time: "0:00"
+  open-pull-requests-limit: 1
+  target-branch: "dev"
+  ignore:
+    # aws sdk is explicitly excluded from bot auto upgrade because: (1) currently the auto upgrade of it breaks test, and
+    # the bot stuck at trying to upgrade it; (2) sdk change has higher risk of breaking the agent so probably safer to
+    # upgrade manually.
+    - dependency-name: "github.com/aws/aws-sdk-go"