Add configuration for context path

Author: meier-rene

README.md

@@ -36,6 +36,8 @@ To make this work with a K8s nginx Ingress one needs to enable the property
 use-forwarded-headers true
 ```
 in the ingress-nginx-controller ConfigMap.
+The application context path can be configured with the environment variable CONTEXT_PATH.
+If not set / is used by default.
 
 ## Build and Run
 Build the service with Maven:

src/main/resources/application.properties

@@ -1,4 +1,5 @@
 spring.application.name=massbank-export-api
+server.servlet.context-path=${CONTEXT_PATH:/}
 server.port = 8080
 logging.level.massbank.RecordParserDefinition=ERROR
 artifact.version=@project.version@