HACK add tag.sh to create kernelci-local-snapshot-xxx tags

Signed-off-by: Guillaume Tucker <guillaume.tucker@collabora.com>

tag.sh

+#!/bin/bash
+
+set -e
+
+px=kernelci-local-snapshot-
+last_tag=$(git tag -l | grep $px | sort | tail -n 1)
+n=$(echo $last_tag | awk '{print substr($0,25)}')
+n="10#$n"
+let 'n=n+1'
+m=`printf "%03d" $n`
+new_tag="$px""$m"
+today=`date +%Y-%m-%d`
+msg="KernelCI local snapshot #$m $today"
+git tag -a "$new_tag" -m "$msg"
+echo "$new_tag"
+
+exit 0