Docker: adding environment variable JAVA_OPTS to set 4Gb of heap space
Docker: adding environment variable JAVA_OPTS to set 4Gb of heap space

Former-commit-id: 4963e8122e753e4e4f8253fd9dadcf8b443762bc
kermitt2/grobid,kermitt2/grobid,kermitt2/grobid,kermitt2/grobid,kermitt2/grobid,kermitt2/grobid