FIX: specify the default branch

Author: jamespollard8

README.md

@@ -32,6 +32,7 @@ Here's an example from our [nats release pipeline](https://github.com/cloudfound
 - name: cf-deployment-concourse-tasks
   type: git
   source:
+    branch: main
     uri: https://github.com/cloudfoundry/cf-deployment-concourse-tasks.git
     tag_filter: v3.*
 ```

ci/pipeline.yml

@@ -94,6 +94,7 @@ resources:
   type: git
   icon: github
   source:
+    branch: main
     uri: [email protected]:cloudfoundry/cf-deployment-concourse-tasks.git
     private_key: ((cfdct_readwrite_deploy_key.private_key))
 
@@ -191,6 +192,7 @@ jobs:
       version: cf-deployment-concourse-tasks-version
   - put: cf-deployment-concourse-tasks
     params:
+      branch: main
       repository: cf-deployment-concourse-tasks-updated
       tag: cf-deployment-concourse-tasks-version/version
       tag_prefix: v