Migrate from bintray (#77)

* Bug fixes & cleanup

* Ignoring private files

* Bug fixes found during testing + added script to generate pgp key

* Added step for closing and releasing staging repository

* Update build.gradle

Disabling test coverage due to timeouts

platform/android/scripts/create-signing-key.sh

@@ -0,0 +1,30 @@
+#!/usr/bin/env bash
+
+set -e
+set -o pipefail
+set -u
+
+cat >foo <<EOF
+     %echo Generating a basic OpenPGP key
+     Key-Type: RSA
+     Key-Length: 4096
+     Subkey-Type: RSA
+     Subkey-Length: 4096
+     Name-Real: Petr Pokorny
+     Name-Comment: MapLibre publish
+     Name-Email: petr.pokorny@maptiler.com
+     Expire-Date: 0
+     Passphrase: < Put your password here >
+     # Do a commit here, so that we can later print "done" :-)
+     %commit
+     %echo done
+EOF
+
+gpg --batch --generate-key foo
+rm foo
+gpg --list-secret-keys
+
+# gpg --keyserver hkp://ipv4.pool.sks-keyservers.net --send-keys < your key here - i.e. 6BCC07D1, last 8 characters > 
+# gpg --keyserver hkps://keys.openpgp.org --send-key 6BCC07D1
+# gpg --export-secret-keys < your key here - i.e. 6BCC07D1, last 8 characters > /Volumes/Src/src/MapTiler/Native/maplibre-gl-native/platform/android/signing-key.gpg
+# base64 /Volumes/Src/src/MapTiler/Native/maplibre-gl-native/platform/android/signing-key.gpg > /Volumes/Src/src/MapTiler/Native/maplibre-gl-native/platform/android/signing-key.text