Remove Make target to build OpenJ9 Docker images

Mised at commit 7817bd6

Author: groldan

Makefile

@@ -26,15 +26,7 @@ build-image-infrastructure:
 	./mvnw clean package -f src/apps/infrastructure \
 	-Ddocker -Ddockerfile.push.skip=$(SKIP_PUSH) -ntp -Dfmt.skip -DskipTests
 
-build-image-infrastructure-openj9:
-	./mvnw clean package -f src/apps/infrastructure \
-	-Dopenj9 -Ddockerfile.push.skip=$(SKIP_PUSH) -ntp -Dfmt.skip -DskipTests
-
 build-image-geoserver:
 	./mvnw clean package -f src/apps/geoserver \
 	-Ddocker -Ddockerfile.push.skip=$(SKIP_PUSH) -ntp -Dfmt.skip -DskipTests
 
-build-image-geoserver-openj9:
-	./mvnw clean package -f src/apps/geoserver \
-	-Dopenj9 -Ddockerfile.push.skip=$(SKIP_PUSH) -ntp -Dfmt.skip -DskipTests
-