[Improve] Add user environment variable configuration file

Author: limc5462

streampark-console/streampark-console-service/src/main/assembly/bin/streampark.sh

@@ -149,6 +149,11 @@ elif [[ -r "$APP_HOME/bin/setenv.sh" ]]; then
   . "$APP_HOME/bin/setenv.sh"
 fi
 
+# The user can be specified in the conf/streampark-env.sh.
+if [[ -f "${APP_CONF}/streampark-env.sh" ]]; then
+  . "${APP_CONF}/streampark-env.sh"
+fi
+
 # For Cygwin, ensure paths are in UNIX format before anything is touched
 if ${cygwin}; then
   # shellcheck disable=SC2006

streampark-console/streampark-console-service/src/main/assembly/conf/streampark-env.sh

@@ -0,0 +1,39 @@
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License.  You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+# Many of the options here are built from the perspective that users
+# may want to provide OVERWRITING values on the command line.
+# For example:
+#
+#  JAVA_HOME=/usr/java
+#
+# Therefore, the vast majority (BUT NOT ALL!) of these defaults
+# are configured for substitution and not append.  If append
+# is preferable, modify this file accordingly.
+
+###
+# Generic settings for STREAMPARK
+###
+
+# Technically, the only required environment variable is JAVA_HOME.
+# All others are optional.  However, the defaults are probably not
+# preferred.  Many sites configure these options outside of streampark,
+# such as in /etc/profile.d
+
+# The java implementation to use. By default, this environment
+# variable is REQUIRED on ALL platforms except OS X!
+# export JAVA_HOME=