refactor: add optional env variables for app properties

src/main/resources/application.properties

 # Config for the OpencoDE platform
 # Token can be an empty string to access public repositories only
-opencode.host=https://gitlab.opencode.de/
+opencode.host=${GITLAB_HOST:https://gitlab.opencode.de/}
 opencode.access-token=${OC_GL_APIKEY}
 opencode.user-name=${OC_GL_USER}
 projects.project-ids=${PROJECT_IDS}
@@ -17,7 +17,7 @@ security.hmac-key=${HMAC_KEY}
 # Tool APIs
 opencode.api.base-path=https://software.opencode.de/api/v1/project/
 opencode.api.ort=/cve-result
-opencode.api.toolService=localhost:8082/api/tool-service
+opencode.api.toolService=${TOOL_SERVICE_FULL_URL:http://tool-service:8082/api/toolresults}
 opencode.api.auth=https://sl.dev.o4oe.de/api/
 opencode.api.auth-api-key=${AUTH_API_KEY}
 # OCCMD specific settings
@@ -53,11 +53,9 @@ spring.jpa.generate-ddl=true
 spring.jpa.show-sql=false
 #---
 spring.config.activate.on-profile=local
-opencode.host=https://gitlab.dev.o4oe.de/
 opencode.analyze-private-repos=true
 # Tool APIs
 opencode.api.base-path=https://sl.dev.o4oe.de/api/v1/project/
-opencode.api.toolService=${TOOL_SERVICE_FULL_URL}
 opencode.api.auth=https://sl.dev.o4oe.de/api/receive-session/
 # Database Settings
 spring.datasource.url=jdbc:postgresql://${host}:26257/${DB_NAME}?sslmode=disable&user=root
@@ -67,7 +65,7 @@ spring.config.import=optional:classpath:.env[.properties]
 #---
 spring.config.activate.on-profile=dev
 # Config for the OpencoDE platform
-opencode.host=https://gitlab.dev.o4oe.de/
+opencode.host=${GITLAB_HOST:https://gitlab.dev.o4oe.de/}
 opencode.analyze-private-repos=true
 # Tool APIs
 opencode.api.base-path=https://sl.dev.o4oe.de/api/v1/project/