Adds ability to change HAPI FHIR JPA server's port with the environment variable server.port

Dockerfile

@@ -31,6 +31,4 @@ COPY --from=build-hapi /tmp/hapi-fhir-jpaserver-starter/target/*.war /usr/local/
 COPY catalina.properties /usr/local/tomcat/conf/catalina.properties
 COPY server.xml /usr/local/tomcat/conf/server.xml
 
-EXPOSE 8080
-
 CMD ["catalina.sh", "run"]

catalina.properties

@@ -206,3 +206,4 @@ tomcat.util.buf.StringCache.byte.enabled=true
 #tomcat.util.buf.StringCache.cacheSize=5000
 
 org.apache.tomcat.util.digester.PROPERTY_SOURCE=org.apache.tomcat.util.digester.Digester$EnvironmentPropertySource
+server.port=8080

server.xml

@@ -39,7 +39,7 @@
          APR (HTTP/AJP) Connector: /docs/apr.html
          Define a non-SSL/TLS HTTP/1.1 Connector on port 8080
     -->
-    <Connector port="8080" protocol="HTTP/1.1"
+    <Connector port="${server.port}" protocol="HTTP/1.1"
                connectionTimeout="20000"
                redirectPort="8443" 
                maxThreads="${server.tomcat.max-threads}"