Add testgen badge to readme (#3933)

Author: jtraglia

.github/workflows/generate_vectors.yml

@@ -52,6 +52,16 @@ jobs:
           cp -r presets/ ../consensus-spec-tests/presets
           cp -r configs/ ../consensus-spec-tests/configs
           find . -type d -empty -delete
+      - name: Check for errors
+        run: |
+          if grep -q "\[ERROR\]" consensustestgen.log; then
+            echo "There is an error in the log"
+            exit 1
+          fi
+          if find . -type f -name "INCOMPLETE" | grep -q "INCOMPLETE"; then
+            echo "There is an INCOMPLETE file"
+            exit 1
+          fi
       - name: Archive configurations
         run: |
           cd consensus-spec-tests

README.md

@@ -8,7 +8,7 @@ This repository hosts the current Ethereum proof-of-stake specifications. Discus
 
 ## Specs
 
-[![GitHub release](https://img.shields.io/github/v/release/ethereum/consensus-specs)](https://github.com/ethereum/consensus-specs/releases/) [![PyPI version](https://badge.fury.io/py/eth2spec.svg)](https://badge.fury.io/py/eth2spec)
+[![GitHub release](https://img.shields.io/github/v/release/ethereum/consensus-specs)](https://github.com/ethereum/consensus-specs/releases/) [![PyPI version](https://badge.fury.io/py/eth2spec.svg)](https://badge.fury.io/py/eth2spec) [![testgen](https://github.com/ethereum/consensus-specs/actions/workflows/generate_vectors.yml/badge.svg?branch=dev&event=schedule)](https://github.com/ethereum/consensus-specs/actions/workflows/generate_vectors.yml)
 
 Core specifications for Ethereum proof-of-stake clients can be found in [specs](specs/). These are divided into features.
 Features are researched and developed in parallel, and then consolidated into sequential upgrades when ready.