Add script to validate & create release tag

auth/scripts/release_tag.sh

@@ -0,0 +1,46 @@
+#!/bin/sh
+
+#!/bin/bash
+
+# Function to display usage
+usage() {
+    echo "Usage: $0 tag"
+    exit 1
+}
+
+# Ensure a tag was provided
+[[ $# -eq 0 ]] && usage
+
+# Exit immediately if a command exits with a non-zero status
+set -e
+
+# Go to the project root directory
+cd "$(dirname "$0")/.."
+
+# Get the tag from the command line argument
+TAG=$1
+
+
+# Get the version from the pubspec.yaml file and cut everything after the +
+VERSION=$(grep "^version:" pubspec.yaml | awk '{ print $2 }' | cut -d '+' -f 1)
+
+PREFIX="auth-v"
+
+# Ensure the tag has the correct prefix
+if [[ $TAG != $PREFIX* ]]; then
+    echo "Invalid tag. tags must start with '$PREFIX'."
+    exit 1
+fi
+
+# Ensure the tag version is in the pubspec.yaml file
+if [[ $TAG != *$VERSION ]]; then
+    echo "Invalid tag."
+    echo "The version $VERSION in pubspec doesn't match the version in tag $TAG"
+    exit 1
+fi
+
+## If all checks pass, create the tag
+git tag $TAG
+echo "Tag $TAG created."
+
+exit 0