docker: DUNITER_INSTANCE_NAME -> DUNITER_NODE_NAME

DUNITER_INSTANCE_NAME is still accepted if DUNITER_NODE_NAME is not
defined.

docker-compose.yml

@@ -18,7 +18,7 @@ services:
       # p2p
       - 30333:30333
     environment:
-      DUNITER_INSTANCE_NAME: "duniter_local"
+      DUNITER_NODE_NAME: "duniter_local"
       DUNITER_CHAIN_NAME: "dev"
       #DUNITER_DISABLE_PROMETHEUS: "false"
     volumes:

docker/docker-entrypoint

@@ -12,8 +12,9 @@ function ternary () {
   fi
 }
 
-if [ -n "$DUNITER_INSTANCE_NAME" ]; then
-  set -- "$@" --name "$DUNITER_INSTANCE_NAME"
+DUNITER_NODE_NAME="${DUNITER_NODE_NAME:-$DUNITER_INSTANCE_NAME}"
+if [ -n "$DUNITER_NODE_NAME" ]; then
+  set -- "$@" --name "$DUNITER_NODE_NAME"
 fi
 
 DUNITER_DISABLE_PROMETHEUS=$(boolean "${DUNITER_DISABLE_PROMETHEUS:-false}")