Reduce time spend in configuration phase (#1528)

Do not add scm-packaging modules to every build.
These modules drastically increase the time Gradle spends in the configuration phase.
To build a distribution of SCM-Manager pass -Pdistribution.
Upgrade Gradle to 6.8.2.

Jenkinsfile

@@ -96,7 +96,7 @@ pipeline {
       }
       steps {
         withPublishEnivronment {
-          gradle "publish"
+          gradle "-Pdistribution publish"
         }
       }
     }

README.md

@@ -107,6 +107,20 @@ Then you can attach a debugger on port 5005.
 The port can be changed by using the `--debug-port` e.g.: `--debug-port=5006`.
 If you want to wait until a debugger is attached, before SCM-Manager starts you can use the `--debug-wait` option.
 
+### Distribution
+
+SCM-Manager provides various modules to deploy SCM-Manager on differnt platforms (e.g. Docker, Helm, RPM, DEB, Windows).
+Those modules are not build by default. 
+To build the distribution modules specify the `distribution` property e.g.:
+
+```bash
+# on unix
+./gradlew -Pdistribution distribution
+
+# on windows
+gradlew.bat -Pdistribution distribution
+```
+
 ### Properties for publishing
 
 The publishing process requires the following properties for authentication and signing.

gradle/wrapper/gradle-wrapper.properties

@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-6.7.1-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.8.2-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists

settings.gradle

@@ -67,11 +67,17 @@ include 'scm-dao-xml'
 include 'scm-webapp'
 include 'scm-server'
 include 'scm-it'
-include 'scm-packaging:unix'
-include 'scm-packaging:windows'
-include 'scm-packaging:deb'
-include 'scm-packaging:rpm'
-include 'scm-packaging:docker'
-include 'scm-packaging:helm'
-include 'scm-packaging:release-yaml'
+
+// Do not add scm-packaging modules to every build,
+// These modules drastically increase the time Gradle spends in the configuration phase.
+// To build a distribution of SCM-Manager you have to pass -Pdistribution
+if (settings.hasProperty("distribution")) {
+  include 'scm-packaging:unix'
+  include 'scm-packaging:windows'
+  include 'scm-packaging:deb'
+  include 'scm-packaging:rpm'
+  include 'scm-packaging:docker'
+  include 'scm-packaging:helm'
+  include 'scm-packaging:release-yaml'
+}