docker: publish a reusable image

.dockerignore

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+# Things we don't want in a Docker image
+.env
+.git
+.github
+.idea
+
+# build artifacts
+coverage
+coverage.json
+node_modules
+typechain
+typechain-types
+
+# Hardhat files
+artifacts
+cache
+deployments

.github/workflows/run_tests_docker.yml

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+name: run-tests
+
+on:
+  pull_request:
+
+concurrency:
+  group: ${{
+    ( github.ref == 'refs/heads/master' &&
+    format('{0}/{1}', github.run_id, github.run_attempt) )
+    ||
+    format('{0}/{1}', github.workflow, github.ref) }}
+  cancel-in-progress: true
+
+
+jobs:
+  run-tests:
+    runs-on: [ ubuntu-22.04 ]
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Build a Docker image
+        run: docker build -t ghcr.io/nilfoundation/evm-placeholder-verifier:${ github.sha }
+

Dockerfile

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+FROM node:18.18-bullseye
+
+ADD . /opt/evm-placeholder-verification
+
+WORKDIR /opt/evm-placeholder-verification
+
+RUN npm install
+RUN npx hardhat compile