Add API_PUBLIC_URL environment variable for public API access

- Added API_PUBLIC_URL to deploy-config and manifest.yml
- Updated app config to load API_PUBLIC_URL from environment
- Used API_PUBLIC_URL in CSP configuration for connect-src

deploy-config/demo.yml

@@ -8,3 +8,4 @@ redis_enabled: 1
 nr_agent_id: '1134302465'
 nr_app_id: '1083160688'
 FEATURE_SOCKET_ENABLED: true
+API_PUBLIC_URL: https://notify-api-demo.app.cloud.gov

deploy-config/production.yml

@@ -8,3 +8,4 @@ redis_enabled: 1
 nr_agent_id: '1050708682'
 nr_app_id: '1050708682'
 FEATURE_SOCKET_ENABLED: false
+API_PUBLIC_URL: https://notify-api-production.app.cloud.gov

deploy-config/staging.yml

@@ -8,3 +8,4 @@ redis_enabled: 1
 nr_agent_id: '1134291385'
 nr_app_id: '1031640326'
 FEATURE_SOCKET_ENABLED: false
+API_PUBLIC_URL: https://notify-api-staging.app.cloud.gov