Pass arguments to Gradle via environment variables (#314)

This PR passes arguments to the Gradle builds via the `LOG4J_VERSION` and `LOG4J_REPOSITORY_URL` environment variables.

This simplifies the build, since no command line parameters need to be used.

Author: ppkarwasz

.github/workflows/gradle-reusable-test.yaml

@@ -71,8 +71,6 @@ jobs:
           LOG4J_REPOSITORY_URL: ${{ inputs.log4j-repository-url }}
         run: |
           ./gradlew \
-          -Plog4j.version=$LOG4J_VERSION \
-          -Plog4j.repository.url=$LOG4J_REPOSITORY_URL \
           :log4j-samples-gradle-metadata:check
 
       - name: Enable KVM
@@ -129,8 +127,6 @@ jobs:
           LOG4J_REPOSITORY_URL: ${{ inputs.log4j-repository-url }}
         run: |
           ./gradlew \
-          -Plog4j.version=$LOG4J_VERSION \
-          -Plog4j.repository.url=$LOG4J_REPOSITORY_URL \
           :app:build :app:connectedCheck
 
       - name: Remove AVD Device

log4j-samples-android/app/build.gradle

@@ -49,7 +49,7 @@ android {
     }
 }
 
-def log4jVersion = providers.gradleProperty("log4j.version").get()
+def log4jVersion = providers.environmentVariable("LOG4J_VERSION").getOrElse("2.+")
 
 dependencies {
 

log4j-samples-gradle-metadata/build.gradle

@@ -18,7 +18,7 @@ plugins {
     id("application")
 }
 
-def log4jVersion = providers.gradleProperty("log4j.version").getOrElse("2.+")
+def log4jVersion = providers.environmentVariable("LOG4J_VERSION").getOrElse("2.+")
 
 application {
     mainModule = "org.example.log4j.metadata"

settings.gradle

@@ -28,7 +28,7 @@ dependencyResolutionManagement {
         mavenCentral()
         // Points to the correct Apache staging repository
         var apacheSnapshots = 'https://repository.apache.org/snapshots'
-        var repositoryUrl = providers.gradleProperty('log4j.repository.url')
+        var repositoryUrl = providers.environmentVariable('LOG4J_REPOSITORY_URL')
                 .filter { !it.isEmpty() }
                 .getOrElse(apacheSnapshots)
         maven {