Use BUILDKITE_PIPELINE_DEFAULT_BRANCH (#475)

This makes it easier to support a `main` default branch in future.

Author: 72636c

.changeset/small-masks-vanish.md

@@ -0,0 +1,5 @@
+---
+'skuba': patch
+---
+
+**template:** Use BUILDKITE_PIPELINE_DEFAULT_BRANCH in `pipeline.yml`

template/express-rest-api/.buildkite/pipeline.yml

@@ -75,7 +75,7 @@ steps:
 
   - wait
   - block: 🙋🏻‍♀️ Deploy Dev
-    branches: '!master'
+    branches: '!${BUILDKITE_PIPELINE_DEFAULT_BRANCH}'
 
   - <<: *dev
     <<: *deploy
@@ -95,7 +95,7 @@ steps:
   - <<: *prod
     <<: *deploy
     label: 🚀 Deploy Prod
-    branches: master
+    branches: ${BUILDKITE_PIPELINE_DEFAULT_BRANCH}
     concurrency_group: <%- teamName %>/deploy/gantry/<%- prodGantryEnvironmentName %>
     depends_on: deploy-dev
     plugins:

template/koa-rest-api/.buildkite/pipeline.yml

@@ -75,7 +75,7 @@ steps:
 
   - wait
   - block: 🙋🏻‍♀️ Deploy Dev
-    branches: '!master'
+    branches: '!${BUILDKITE_PIPELINE_DEFAULT_BRANCH}'
 
   - <<: *dev
     <<: *deploy
@@ -95,7 +95,7 @@ steps:
   - <<: *prod
     <<: *deploy
     label: 🚀 Deploy Prod
-    branches: master
+    branches: ${BUILDKITE_PIPELINE_DEFAULT_BRANCH}
     concurrency_group: <%- teamName %>/deploy/gantry/<%- prodGantryEnvironmentName %>
     depends_on: deploy-dev
     plugins:

template/lambda-sqs-worker-cdk/.buildkite/pipeline.yml

@@ -56,7 +56,7 @@ steps:
 
   - wait
   - block: 🙋🏻‍♀️ Deploy Dev
-    branches: '!master'
+    branches: '!${BUILDKITE_PIPELINE_DEFAULT_BRANCH}'
 
   - <<: *dev
     <<: *deploy
@@ -72,7 +72,7 @@ steps:
   - <<: *prod
     <<: *deploy
     label: 🚀 Deploy Prod
-    branches: master
+    branches: ${BUILDKITE_PIPELINE_DEFAULT_BRANCH}
     commands:
       - echo '--- yarn build'
       - yarn build

template/lambda-sqs-worker/.buildkite/pipeline.yml

@@ -61,7 +61,7 @@ steps:
 
   - wait
   - block: 🙋🏻‍♀️ Deploy Dev
-    branches: '!master'
+    branches: '!${BUILDKITE_PIPELINE_DEFAULT_BRANCH}'
 
   - <<: *dev
     <<: *deploy
@@ -73,7 +73,7 @@ steps:
 
   - <<: *prod
     <<: *deploy
-    branches: master
+    branches: ${BUILDKITE_PIPELINE_DEFAULT_BRANCH}
     command: yarn deploy
     concurrency_group: <%- repoName %>/deploy/prod
     label: 🚀 Deploy Prod