chore: Use the .env file to manage the version number

Now that we have the `docker-compose.yaml` files reading from a `.env` file, we can use the same file to configure Gradle. This provides a single point to configure the version for the whole project.

RELEASING.md

@@ -2,26 +2,24 @@
 
 The following lists describe the steps necessary to release a new version.
 
+1. Update the version number in `.env`
+
 ## SpringWolf
 
-1. Update version number in `build.gradle`
-2. Run all tests (including all examples + integration)
-3. Run github `Publish releases` pipeline
-4. Release version in nexus
-5. Update version number on website
+1. Run all tests (including all examples + integration)
+2. Run github `Publish releases` pipeline
+3. Release version in nexus
+4. Update version number on website
 
 ## springwolf-ui
 
-1. Update version number in `build.gradle`
-2. Update version number in `README.md`
-3. Run github `Publish releases` pipeline
-4. Release version in nexus
-5. Update version number on website
+1. Update version number in `README.md`
+2. Run github `Publish releases` pipeline
+3. Release version in nexus
+4. Update version number on website
 
 ## Plugins
 
-1. Update version number in `.env`
-
 ### springwolf-amqp
 
 1. Update version number in

build.gradle

@@ -13,6 +13,8 @@ plugins {
     id("org.owasp.dependencycheck") version "8.3.1"
 }
 
+getenv().each { key, value -> if (System.getProperty(key as String) == null) { System.setProperty(key as String, value as String) } }
+
 allprojects {
     apply plugin: 'java'
     apply plugin: 'maven-publish'
@@ -22,7 +24,7 @@ allprojects {
         isSnapshot = Boolean.valueOf(project.findProperty('SNAPSHOT') as String)
     }
     group 'io.github.springwolf'
-    version '0.13.0' + (isSnapshot ? '-SNAPSHOT' : '')
+    version System.getProperty("SPRINGWOLF_VERSION") + (isSnapshot ? '-SNAPSHOT' : '')
 
     java {
         sourceCompatibility = JavaVersion.VERSION_17
@@ -118,4 +120,21 @@ allprojects {
 dependencyCheck {
     outputDirectory = "$buildDir/reports/owasp-dependency-check"
     formats = [ReportGenerator.Format.SARIF.toString()]
-}
+}
+
+def static getenv(path = ".env") {
+    def env = [:]
+
+    def file = new File(path)
+    if (file.exists()) {
+        file.eachLine { line ->
+            line = line.trim()
+            if (line != "" && !line.startsWith("#")) {
+                def pair = line.split("=", 2)
+                env[pair[0].trim()] = pair.length == 2 ? pair[1].trim() : ""
+            }
+        }
+    }
+
+    return env
+}