Set gradle build version to drone tag or build

.drone.yml

@@ -5,4 +5,5 @@ steps:
   - name: Run the Gradle build
     image: glmdev/java-gradle-maven
     commands:
+      - ./prep_workspace.bash
       - ./gradlew build shadowJar reobfShadowJar

build.gradle

@@ -17,7 +17,7 @@ apply plugin: 'net.minecraftforge.gradle'
 apply plugin: 'eclipse'
 apply plugin: 'maven-publish'
 
-version = '1.3'
+version = '%%CI_BUILD_VERSION%%'
 group = 'dev.garrettmills.csx.matterlinkreboot' // http://maven.apache.org/guides/mini/guide-naming-conventions.html
 archivesBaseName = 'matterlinkreboot'
 

prep_workspace.bash

@@ -0,0 +1,9 @@
+#!/bin/bash -xe
+
+CI_SUB="$DRONE_TAG"
+
+if [ -z "$CI_SUB" ]; then
+    CI_SUB="ci${DRONE_BUILD_NUMBER}"
+fi
+
+sed -i -e "s/%%CI_BUILD_VERSION%%/${CI_SUB}/g" build.gradle