remove dead code from gradle wrt BUILD_TIMESTAMPS used in signal for expiring builds

build.gradle

@@ -1,5 +1,3 @@
-import java.security.MessageDigest
-
 buildscript {
     repositories {
         maven {
@@ -158,7 +156,6 @@ android {
         vectorDrawables.useSupportLibrary = true
         project.ext.set("archivesBaseName", "Deltachat");
 
-        buildConfigField "long", "BUILD_TIMESTAMP", getLastCommitTimestamp() + "L"
         buildConfigField "boolean", "DEV_BUILD", "false"
 
         ndk {
@@ -265,59 +262,3 @@ android {
         abortOnError false
     }
 }
-
-task assembleWebsiteDescriptor << {
-    android.applicationVariants.all { variant ->
-        if (variant.name.equals("websiteDebug") ||
-            variant.name.equals("websiteRelease"))
-        {
-            File file = new File(variant.outputs[0].outputFile.path)
-
-            if (file.exists()) {
-                MessageDigest md = MessageDigest.getInstance("SHA-256");
-                file.eachByte 4096, {bytes, size ->
-                    md.update(bytes, 0, size);
-                }
-
-                String digest = md.digest().collect {String.format "%02x", it}.join();
-                String url = variant.productFlavors.get(0).ext.websiteUpdateUrl
-                String apkName = variant.outputs[0].outputFile.name
-
-                String descriptor = "{" +
-                        "\"versionCode\" : $project.android.defaultConfig.versionCode," +
-                        "\"versionName\" : \"$project.android.defaultConfig.versionName\"," +
-                        "\"sha256sum\" : \"$digest\"," +
-                        "\"url\" : \"$url/$apkName\"" +
-                        "}"
-
-                File descriptorFile = new File(variant.outputs[0].outputFile.parent, apkName.replace(".apk", ".json"))
-
-                descriptorFile.write(descriptor)
-            }
-        }
-    }
-}
-
-tasks.whenTaskAdded { task ->
-    if (task.name.equals("lint")) {
-        task.enabled = false
-    }
-
-    if (task.name.equals("assembleWebsiteDebug") ||
-        task.name.equals("assembleWebsiteRelease"))
-    {
-         task.finalizedBy assembleWebsiteDescriptor
-    }
-}
-
-def getLastCommitTimestamp() {
-    new ByteArrayOutputStream().withStream { os ->
-        def result = exec {
-            executable = 'git'
-            args = ['log', '-1', '--pretty=format:%ct']
-            standardOutput = os
-        }
-
-        return os.toString() + "000"
-    }
-}