add github actions

.github/workflows/publish.yml

@@ -0,0 +1,19 @@
+name: Publish to Pub.dev
+
+on: 
+  push: 
+    tags:
+      - v*
+
+jobs:
+  publishing:
+    runs-on: ubuntu-latest
+    steps:
+      - name: 'Checkout'
+        uses: actions/checkout@main # required!
+
+      - name: '>> Dart package <<'
+        uses: k-paxian/dart-package-publisher@master
+        with:
+          accessToken: ${{ secrets.OAUTH_ACCESS_TOKEN }}
+          refreshToken: ${{ secrets.OAUTH_REFRESH_TOKEN }}

pubspec.yaml

@@ -1,6 +1,6 @@
 name: xpx_crypto
 description: Official ProximaX Sirius Blockchain implementation ed25519 encryption modules for Dart.
-version: 0.0.4+1
+version: 0.0.4+3
 homepage: https://github.com/proximax-storage/dart-xpx-crypto
 #author: 'Eleazar Garrido <eleazertovar123@gmail.com>'