Reproducible build: we also need a build script.

Part of #418.

RELEASE_BUILD.sh

@@ -0,0 +1,28 @@
+#!/bin/bash
+
+set -e
+
+export JAVA_HOME=/usr/lib/jvm/java-17-openjdk-amd64/
+
+JAVA_VERSION=`java --version`
+if [[ $JAVA_VERSION != "openjdk 17."* ]]; then
+  echo "OpenJDK version should be 17.X"
+  exit -1;
+fi
+
+RELEASE_STORE_PASSWORD=
+read -s -p "Enter store password: " RELEASE_STORE_PASSWORD
+echo ""
+read -s -p "Enter key alias: " RELEASE_KEY_ALIAS
+echo ""
+read -s -p "Enter key password: " RELEASE_KEY_PASSWORD
+echo ""
+
+./gradlew --no-configuration-cache \
+  clean \
+  assembleReproducibleRelease \
+  -Drelease_store_file=`ls ../*.jks` \
+  -Drelease_store_file="../keystore_opentracks.jks" \
+  -Drelease_store_password="$RELEASE_STORE_PASSWORD" \
+  -Drelease_key_alias="$RELEASE_KEY_ALIAS" \
+  -Drelease_key_password="$RELEASE_KEY_PASSWORD"

build.gradle

@@ -84,6 +84,14 @@ android {
                 keyPassword System.getProperty('nightly_key_password')
             }
         }
+        release {
+            if (System.getProperty("release_store_file") != null) {
+                storeFile file(System.getProperty("release_store_file"))
+                storePassword System.getProperty("release_store_password")
+                keyAlias System.getProperty("release_key_alias")
+                keyPassword System.getProperty("release_key_password")
+            }
+        }
     }
 
     namespace 'de.dennisguse.opentracks'
@@ -113,12 +121,13 @@ android {
             applicationId 'de.dennisguse.opentracks'
             versionNameSuffix 'irreproducible'
         }
-         reproducible {
+        reproducible {
             // Developer Binaries: https://github.com/OpenTracksApp/OSMDashboard/releases/download/v%v/de.dennisguse.opentracks.playstore_%v.apk
             // FDroid: https://f-droid.org/de/packages/de.dennisguse.opentracks.playstore
             // PlayStore: https://play.google.com/store/apps/details?id=de.dennisguse.opentracks.playstore
             dimension 'version'
             applicationId 'de.dennisguse.opentracks.playstore'
+            signingConfig signingConfigs.release
         }
     }
 
@@ -132,7 +141,7 @@ android {
                 outputFileName = "${applicationId}_${variant.versionCode}.apk"
             }
 
-            if (variant.flavorName== 'nightly') {
+            if (variant.flavorName == 'nightly') {
                 setVersionCodeOverride(getVersionCode())
                 setVersionNameOverride(getVersionName())
             }