Register a task to store project version (#21)

Author: petertrr

gradle-modules/src/main/kotlin/org.sonarsource.cloud-native.sonar-plugin.gradle.kts

@@ -26,7 +26,7 @@ val cleanupTask = tasks.register<Delete>("cleanupOldVersion") {
     description = "Clean up jars of old plugin version"
 
     delete(
-        fileTree(project.layout.buildDirectory.dir("libs")).matching {
+        fileTree(layout.buildDirectory.dir("libs")).matching {
             include("${project.name}-*.jar")
             exclude("${project.name}-${project.version}-*.jar")
         }

gradle-modules/src/main/kotlin/org/sonarsource/cloudnative/gradle/CommonSettingsPlugin.kt

@@ -48,6 +48,26 @@ open class CommonSettingsPlugin
                 }
             }
 
+            settings.gradle.rootProject {
+                tasks.register("storeProjectVersion") {
+                    group = "build"
+                    description = "Store the project version in a file to be used in CI caches"
+                    inputs.property("version", this@rootProject.version)
+                    val projectVersionFile =
+                        file(
+                            "${System.getenv(
+                                "CIRRUS_WORKING_DIR"
+                            )}/${System.getenv("PROJECT_VERSION_CACHE_DIR")}/evaluated_project_version.txt"
+                        )
+                    outputs.file(projectVersionFile)
+                    outputs.cacheIf { true }
+
+                    doLast {
+                        projectVersionFile.writeText(this@rootProject.version.toString())
+                    }
+                }
+            }
+
             settings.configureDevelocity()
         }