Add Google Play Publisher plugin and Play Store assets

.secret/decrypt.sh

@@ -0,0 +1,16 @@
+#!/bin/sh
+cd "$(dirname "$0")"
+if [ -z "$GPG_PASSWORD" ]; then
+	echo Env variable GPG_PASSWORD must be defined
+	exit 1
+fi
+for file in gcp-key.json keystore.jks gradle.properties env; do
+	gpg \
+		--quiet \
+		--batch \
+		--yes \
+		--decrypt \
+		--passphrase="$GPG_PASSWORD" \
+		--output $file \
+		$file.gpg
+done

.secret/gradle.properties.gpg

@@ -0,0 +1 @@
+<EFBFBD>