APK - added keystore for publishing to Play Store

.gitignore

@@ -54,3 +54,7 @@ buck-out/
 */fastlane/report.xml
 */fastlane/Preview.html
 */fastlane/screenshots
+
+#app signing .keystore file
+android/gradle.properties
+android/app/blockmason-lndr-android.keystore

android/app/build.gradle

@@ -107,6 +107,16 @@ android {
             abiFilters "armeabi-v7a", "x86"
         }
     }
+    signingConfigs {
+        release {
+            if (project.hasProperty('MYAPP_RELEASE_STORE_FILE')) {
+                storeFile file(MYAPP_RELEASE_STORE_FILE)
+                storePassword MYAPP_RELEASE_STORE_PASSWORD
+                keyAlias MYAPP_RELEASE_KEY_ALIAS
+                keyPassword MYAPP_RELEASE_KEY_PASSWORD
+            }
+        }
+    }
     splits {
         abi {
             reset()
@@ -119,6 +129,7 @@ android {
         release {
             minifyEnabled enableProguardInReleaseBuilds
             proguardFiles getDefaultProguardFile("proguard-android.txt"), "proguard-rules.pro"
+            signingConfig signingConfigs.release
         }
     }
     // applicationVariants are e.g. debug, release