Prepare for reading from env var

Author: etiennestuder

.github/workflows/gradle-release.yml

@@ -19,6 +19,9 @@ jobs:
                     java-version: '8'
             -   name: Build and deploy with Gradle
                 uses: eskatos/gradle-command-action@v1
+                env:
+                    BINTRAY_USER: ${{ secrets.BINTRAY_USER }}
+                    BINTRAY_API_KEY: ${{ secrets.BINTRAY_API_KEY }}
                 with:
                     arguments: clean -i build generatePomFileForPluginPublicationPublication bintrayUpload -PRELEASE -Porg.gradle.java.installations.fromEnv=JAVA_HOME_6_0_119_X64 -PjavaCompilerVersion=6 -Pteamcity-build-scan-plugin.acceptGradleTOS=true
                     wrapper-cache-enabled: true

build.gradle

@@ -90,8 +90,8 @@ publishing.publications {
 }
 
 bintray {
-    user = credentials.BINTRAY_USER
-    key = credentials.BINTRAY_API_KEY
+    user = credentials.BINTRAY_USER ?: System.getenv('BINTRAY_USER')
+    key = credentials.BINTRAY_API_KEY ?: System.getenv('BINTRAY_API_KEY')
     publications = ['PluginPublication']
 
     publish = true