[#2027] Use env-vars for passing secrets used during release

Author: sebersole

publish.gradle

@@ -104,9 +104,9 @@ gradle.taskGraph.whenReady { TaskExecutionGraph graph ->
     }
 
     if ( wasPublishingRequested ) {
-        def ossrhUser = System.getenv().get( "ORG_GRADLE_PROJECT_sonatypeUsername" )
-        def ossrhPass = System.getenv().get( "ORG_GRADLE_PROJECT_sonatypePassword" )
-        if ( ossrhUser == null || ossrhPass == null ) {
+        def publishUser = resolvePublishUser()
+        def publishPass = resolvePublishPass()
+        if ( publishUser == null || publishPass == null ) {
             throw new RuntimeException( "Cannot perform publishing to OSSRH without credentials." )
         }
         logger.lifecycle "Publishing groupId: '" + project.group + "', version: '" + project.version + "'"
@@ -131,6 +131,41 @@ gradle.taskGraph.whenReady { TaskExecutionGraph graph ->
     }
 }
 
+String resolvePublishUser() {
+    var envVar = System.getenv().get( "ORG_GRADLE_PROJECT_sonatypeUsername" )
+    if ( envVar != null ) {
+        return envVar
+    }
+
+    def projectProp = projectPropOrNull( "sonatypeUsername" )
+    if ( projectProp != null ) {
+        return projectProp
+    }
+
+    return null
+}
+
+String resolvePublishPass() {
+    var envVar = System.getenv().get( "ORG_GRADLE_PROJECT_sonatypePassword" )
+    if ( envVar != null ) {
+        return envVar
+    }
+
+    def projectProp = projectPropOrNull( "sonatypePassword" )
+    if ( projectProp != null ) {
+        return projectProp
+    }
+
+    return null
+}
+
+String projectPropOrNull(String name) {
+    if ( project.hasProperty( name ) ) {
+        return project.findProperty( name )
+    }
+    return null;
+}
+
 
 static String resolveSigningKey() {
     var key = System.getenv().get( "SIGNING_GPG_PRIVATE_KEY" )