move docker-build groovy script to docker repo

For all docker builds, policy is using groovy-maven-plugin
to run a groovy script to determine the tag for docker.

The plan is:
1, move docker-tag groovy script to docker repo.
2, change source for groovy-maven-plugin to a URL
   below, that will point to the source code from
   step #1.

   <configuration>
       <source>https://raw.githubusercontent.com/onap
       /policy-docker/master/utils/groovy
       /docker-tag.groovy</source>
   </configuration>

Issue-ID: POLICY-3378
Change-Id: Iff1f09e5ae47205240305b09602c49d403fad98f
Signed-off-by: Taka Cho <[email protected]>

Author: Taka Cho

utils/groovy/docker-tag.groovy

@@ -0,0 +1,34 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * ONAP POLICY
+ * ================================================================================
+ * Copyright (C) 2021 AT&T Intellectual Property. All right reserved.
+ * ================================================================================
+ * Licensed 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.
+ * ============LICENSE_END============================================
+ * ===================================================================
+ *
+ */
+println 'Project version: ' + project.properties['dist.project.version']
+if (project.properties['dist.project.version'] != null) {
+    def versionArray = project.properties['dist.project.version'].split('-')
+    def minMaxVersionArray = versionArray[0].tokenize('.')
+    if (project.properties['dist.project.version'].endsWith("-SNAPSHOT")) {
+        project.properties['project.docker.latest.minmax.tag.version'] =
+             minMaxVersionArray[0] + "." + minMaxVersionArray[1] + "-SNAPSHOT-latest"
+     } else {
+        project.properties['project.docker.latest.minmax.tag.version'] =
+             minMaxVersionArray[0] + "." + minMaxVersionArray[1] + "-STAGING-latest"
+     }
+     println 'New tag for docker: ' + properties['project.docker.latest.minmax.tag.version']
+}