feat(releaser): add script to ease release process [skip ci]

.github/releaser.sh

@@ -0,0 +1,14 @@
+#!/bin/sh
+
+# Trigger release action on new release
+
+if [ -z "$1" ]; then
+    echo "Please provide a version number."
+    echo "Usages: $0 [X.Y.Z]"
+    exit 1
+fi
+
+version=$1
+
+git tag -a "v$version" -m "Release version $version"
+git push origin "v$version"