gha emulator build

Author: nialexsan

.github/workflows/build-flow-emulator.yml

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+name: 'Build and Push Flow Emulator Image'
+
+on:
+  workflow_dispatch:
+
+env:
+  DOCKER_IMAGE_URL: us-west1-docker.pkg.dev/dl-flow-devex-staging/backend/flow-emulator:${{ github.sha }}
+
+jobs:
+  build-and-push:
+    runs-on: ubuntu-latest
+
+    permissions:
+      contents: read
+      id-token: write
+
+    steps:
+      - name: 'Checkout'
+        uses: 'actions/checkout@v4'
+        with:
+          submodules: recursive
+          token: ${{ secrets.GH_PAT }}
+
+      - id: 'auth'
+        name: 'Authenticate to Google Cloud'
+        uses: 'google-github-actions/auth@v2'
+        with:
+          workload_identity_provider: '${{ vars.BUILDER_WORKLOAD_IDENTITY_PROVIDER }}'
+          service_account: '${{ vars.BUILDER_SERVICE_ACCOUNT }}'
+
+      - name: 'Set up gcloud'
+        uses: 'google-github-actions/setup-gcloud@v1'
+        with:
+          project_id: ${{ vars.GAR_PROJECT_ID }}
+
+      - name: 'Build and Push Flow Emulator'
+        run: |
+          gcloud auth configure-docker ${{ vars.GAR_REGION }}-docker.pkg.dev
+          docker build -t "${{ env.DOCKER_IMAGE_URL }}" .
+          docker push "${{ env.DOCKER_IMAGE_URL }}"

Dockerfile

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+FROM debian:stable-slim
+
+ENV FLOW_INSTALL_URL=https://raw.githubusercontent.com/onflow/flow-cli/master/install.sh \
+    APP_HOME=/app \
+    SEED_DIR=/seed/state
+
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    curl ca-certificates jq bash openssl netcat-openbsd git \
+ && rm -rf /var/lib/apt/lists/*
+
+# Install Flow CLI
+RUN bash -lc 'curl -fsSL "$FLOW_INSTALL_URL" | bash' \
+ && mv /root/.local/bin/flow /usr/local/bin/flow \
+ && chmod +x /usr/local/bin/flow \
+ && flow version
+
+WORKDIR ${APP_HOME}
+# Bring in your project files (flow.json, contracts/, scripts/, transactions/, etc.)
+COPY . ${APP_HOME}
+RUN chmod +x ${APP_HOME}/scripts/*.sh || true
+
+# ---------- PRE-SEED AT BUILD TIME ----------
+# Start emulator in background with --persist, wait, seed, then stop.
+RUN bash -lc '\
+  set -euo pipefail; \
+  mkdir -p "$SEED_DIR"; \
+  echo "▶ Start emulator (build-time) with --persist to ${SEED_DIR}"; \
+  flow emulator start --verbose --persist "$SEED_DIR" > /tmp/emulator-build.log 2>&1 & \
+  EM_PID=$!; \
+  echo -n "⏳ Waiting for emulator ... "; \
+  for i in {1..60}; do nc -z 127.0.0.1 3569 && break || { echo -n "."; sleep 1; }; done; echo; \
+  echo "▶ Seeding"; \
+  # Your seed scripts can use `--network emulator` exactly like at runtime:
+  [ -x ./local/setup_wallets.sh ] && ./local/setup_wallets.sh || true; \
+  [ -x ./local/setup_emulator.sh ] && ./local/setup_emulator.sh || true; \
+  echo "▶ Stop emulator (build-time)"; \
+  kill $EM_PID && wait $EM_PID || true \
+'
+
+# ---------- RUNTIME ----------
+EXPOSE 3569 8080
+ENV FLOW_EMULATOR_FLAGS="--verbose --persist /seed/state"
+
+# At runtime we just start the emulator that already contains the baked state.
+ENTRYPOINT [ "bash", "-lc", "flow emulator start $FLOW_EMULATOR_FLAGS" ]