chore(pipelines): update Bitbucket default branch name (#2397)

Bitbucket has changed their default branch name from 'master' to 'main'; this updates our pipeline verbiage accordingly.

Fixes #2396.
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Author: huanjani

internal/pkg/cli/pipeline_init.go

@@ -59,7 +59,7 @@ const (
 	fmtCCRepoURL    = "https://%s.console.%s/codesuite/codecommit/repositories/%s/browse" // Ex: "https://region.console.aws.amazon.com/codesuite/codecommit/repositories/repoName/browse"
 	// For a Bitbucket repository.
 	bbURL           = "bitbucket.org"
-	defaultBBBranch = "master"
+	defaultBBBranch = "main"
 	fmtBBRepoURL    = "https://%s@%s/%s/%s" // Ex: "https://repoOwner@bitbucket.org/repoOwner/repoName
 )
 

internal/pkg/deploy/cloudformation/stack/bb_pipeline_integration_test.go

@@ -26,7 +26,7 @@ func TestBB_Pipeline_Template(t *testing.T) {
 		Source: &deploy.BitbucketSource{
 			ProviderName:  manifest.BitbucketProviderName,
 			RepositoryURL: "https://huanjani@bitbucket.org/huanjani/sample",
-			Branch:        "master",
+			Branch:        "main",
 		},
 		Build: deploy.PipelineBuildFromManifest(nil),
 		Stages: []deploy.PipelineStage{

internal/pkg/deploy/cloudformation/stack/testdata/pipeline/bb_template.yaml

@@ -271,7 +271,7 @@ Resources:
               Configuration:
                 ConnectionArn: !Ref SourceConnection
                 FullRepositoryId: huanjani/sample
-                BranchName: master
+                BranchName: main
               OutputArtifacts:
                 - Name: SCCheckoutArtifact
               RunOrder: 1

site/content/docs/manifest/pipeline.en.md

@@ -53,7 +53,7 @@ The name of AWS Secrets Manager secret that holds the GitHub access token to tri
     As of AWS Copilot v1.4.0, the access token is no longer needed for GitHub repository sources. Instead, Copilot will trigger the pipeline [using AWS CodeStar connections](https://docs.aws.amazon.com/codepipeline/latest/userguide/update-github-action-connections.html).
 
 <span class="parent-field">source.properties.</span><a id="source-properties-branch" href="#source-properties-branch" class="field">`branch`</a> <span class="type">String</span>  
-The name of the branch in your repository that triggers the pipeline. The default for GitHub and CodeCommit is `main`; the default for Bitbucket is `master`.
+The name of the branch in your repository that triggers the pipeline. The default branch name is `main`.
 
 <span class="parent-field">source.properties.</span><a id="source-properties-repository" href="#source-properties-repository" class="field">`repository`</a> <span class="type">String</span>  
 The URL of your repository.