Adding tag.sh script to add new version tags

tag.sh

@@ -0,0 +1,29 @@
+#!/bin/bash
+set -e
+
+if [ -z "$1" ]; then
+    echo usage: $0 TAG
+    exit 1
+fi
+
+if [ -n "$(git tag -l $1)" ]; then
+    echo $1 tag exists run
+    echo "    " git tag -d $1
+    exit 1
+fi
+
+git tag $1
+TAGS="refs/tags/$1"
+
+git tag client/${1/v3./v2.30}
+TAGS="$TAGS client/${1/v3./v2.30}"
+
+for i in */; do
+  if [ -f $i/go.mod ]; then
+	  git tag -d $i$1 2>/dev/null || true
+    git tag $i$1
+    TAGS="$TAGS refs/tags/$i$1"
+  fi
+done
+
+echo git push '$REMOTE' "$TAGS"