VED-719: Add blue / green proxy release pipeline.

Author: mfjarvis

azure/azure-prod-proxy-release-pipeline.yml

@@ -0,0 +1,43 @@
+name: "$(SourceBranchName)+$(BuildID)"
+
+trigger: none
+pr: none
+
+resources:
+  repositories:
+    - repository: common
+      type: github
+      name: NHSDigital/api-management-utils
+      ref: refs/heads/edge
+      endpoint: NHSDigital
+  pipelines:
+  - pipeline: build_pipeline
+    source: "Immunisation-Fhir-Api-Build"
+    trigger:
+      branches:
+        include:
+          - release-*
+
+pool:
+  name: 'AWS-ECS'
+
+variables:
+  - template: project.yml
+
+extends:
+  template: azure/common/apigee-deployment.yml@common
+  parameters:
+    service_name: ${{ variables.service_name }}
+    short_service_name: ${{ variables.short_service_name }}
+    service_base_path: ${{ variables.service_base_path }}
+    prod_requires_approval: true
+    prod_producer_approval: true
+    apigee_deployments:
+      - environment: prod
+        stage_name: blue
+        jinja_templates:
+          DOMAIN_ENDPOINT: https://blue.imms.prod.vds.platform.nhs.uk
+      - environment: prod
+        stage_name: green
+        jinja_templates:
+          DOMAIN_ENDPOINT: https://green.imms.prod.vds.platform.nhs.uk