add execution spec tests in CI

.github/workflows/spectest.yml

@@ -0,0 +1,35 @@
+name: Execution spec tests
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master, kaustinen-with-shapella ]
+  workflow_dispatch:
+
+jobs:
+  build:
+    runs-on: self-hosted
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up Go
+        uses: actions/setup-go@v2
+        with:
+          go-version: 1.22.4
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: 3.10.14
+      - name: Build
+        run: |
+          go build ./cmd/evm
+          git clone https://github.com/ethereum/execution-spec-tests
+          cd execution-spec-tests
+          git checkout 88e54ac3b0324b0b9e7428e92c6b8073d5be9ed5 -b verkle/main
+          rm -rf venv
+          python3 -m venv venv
+          . venv/bin/activate
+          pip install -e .[docs,lint,test] --force-reinstall
+          solc-select use 0.8.24 --always-install
+          rm -rf fixtures
+          fill --fork EIP6800Transition -m blockchain_test --evm-bin=../evm -n auto