add release helper script

Author: tsachev

script/release

@@ -0,0 +1,59 @@
+#!/bin/bash
+
+# About:
+#
+# This is a helper script to tag and push a new release. GitHub Actions use
+# release tags to allow users to select a specific version of the action to use.
+#
+# See: https://github.com/actions/typescript-action#publishing-a-new-release
+#
+# This script will do the following:
+#
+# 1. Get the latest release tag
+# 2. Prompt the user for a new release tag
+# 3. Tag the new release
+# 4. Push the new tag to the remote
+#
+# Usage:
+#
+# script/release
+
+# Terminal colors
+OFF='\033[0m'
+RED='\033[0;31m'
+GREEN='\033[0;32m'
+BLUE='\033[0;34m'
+
+# Get the latest release tag
+latest_tag=$(git describe --tags "$(git rev-list --tags --max-count=1)")
+
+if [[ -z "$latest_tag" ]]; then
+    # There are no existing release tags
+    echo -e "No tags found (yet) - Continue to create and push your first tag"
+    latest_tag="[unknown]"
+fi
+
+# Display the latest release tag
+echo -e "The latest release tag is: ${BLUE}${latest_tag}${OFF}"
+
+# Prompt the user for the new release tag
+read -r -p 'Enter a new release tag (vX.X.X format): ' new_tag
+
+# Validate the new release tag
+tag_regex='v[0-9]+\.[0-9]+\.[0-9]+$'
+if echo "$new_tag" | grep -q -E "$tag_regex"; then
+    echo -e "Tag: ${BLUE}$new_tag${OFF} is valid"
+else
+    # Release tag is not `vX.X.X` format
+    echo -e "Tag: ${BLUE}$new_tag${OFF} is ${RED}not valid${OFF} (must be in vX.X.X format)"
+    exit 1
+fi
+
+# Tag the new release
+git tag -a "$new_tag" -m "$new_tag Release"
+echo -e "${GREEN}Tagged: $new_tag${OFF}"
+
+# Push the new tag to the remote
+git push --tags
+echo -e "${GREEN}Release tag pushed to remote${OFF}"
+echo -e "${GREEN}Done!${OFF}"