Pre-baked Anvil+XMTPD docker image (#273)

The purpose of this image is it's usage in `libxmtp` without having to
pull all the requirements.

We now automatically build a `ghcr.io/xmtp/anvil-xmtpd` image that
contains 2 endpoints (localhost:5050 and localhost:5051) along with the
default test keys.

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

- **New Features**
- Introduced a GitHub Actions workflow to automate Docker image building
and pushing.
- Added a new Dockerfile for building an image with the Foundry
framework and XMTPD Node contracts.
	- Created a shell script to run the Anvil tool in the background.

- **Documentation**
	- Updated metadata labels in the Dockerfile for better maintainability.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

.github/workflows/build-pre-baked-images.yml

@@ -0,0 +1,53 @@
+name: Build pre-baked images
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+  workflow_dispatch:
+
+jobs:
+  push_to_registry:
+    name: Push Docker Image to GitHub Packages
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+    env:
+      DOCKER_METADATA_PR_HEAD_SHA: true
+    outputs:
+      digest: ${{ steps.push.outputs.digest }}
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          submodules: recursive
+      - name: Log in to the container registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract metadata (tags, labels) for Docker
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ghcr.io/xmtp/anvil-xmtpd
+          tags: |
+            type=ref,event=branch
+            type=ref,event=pr
+            type=sha
+            type=raw,value=latest,enable={{is_default_branch}}
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v6
+        id: push
+        with:
+          context: .
+          file: ./dev/baked/Dockerfile
+          push: ${{ github.event_name != 'pull_request' }}
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          build-args: "FOUNDRY_VERSION=nightly-2044faec64f99a21f0e5f0094458a973612d0712"

dev/baked/Dockerfile

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+# BUILD IMAGE --------------------------------------------------------
+ARG GO_VERSION=1.22
+ARG FOUNDRY_VERSION=nightly
+FROM golang:${GO_VERSION}-bookworm as builder
+
+WORKDIR /app
+
+SHELL ["/bin/bash", "-c"]
+
+RUN apt-get update &&  \
+    apt-get install -y curl git jq && \
+    apt-get clean && \
+    rm -rf /var/lib/apt/lists/*
+
+RUN curl -L https://foundry.paradigm.xyz | bash && \
+    source ~/.bashrc && \
+    foundryup -v "${FOUNDRY_VERSION}" &&  \
+    cp ~/.foundry/bin/* /usr/local/bin
+
+COPY . .
+
+# It seems that anvil flushes the file to disk on shutdown and it takes a few ms to be persisted
+# That gives us the pkill+sleep requirement
+RUN dev/docker/anvil-background && \
+    dev/contracts/deploy-local && \
+    dev/register-local-node && \
+    dev/register-local-node-2 && \
+    pkill -f anvil && \
+    sleep 5
+
+RUN echo "export XMTPD_CONTRACTS_NODES_ADDRESS="$(jq -r '.deployedTo' build/Nodes.json)"" >> contracts.env && \
+    echo "export XMTPD_CONTRACTS_MESSAGES_ADDRESS="$(jq -r '.deployedTo' build/GroupMessages.json)""  >> contracts.env && \
+    echo "export XMTPD_CONTRACTS_IDENTITY_UPDATES_ADDRESS="$(jq -r '.deployedTo' build/IdentityUpdates.json)""  >> contracts.env
+
+# ACTUAL IMAGE -------------------------------------------------------
+
+FROM ghcr.io/foundry-rs/foundry
+
+LABEL maintainer="engineering@xmtp.com"
+LABEL source="https://github.com/xmtp/xmtpd"
+LABEL description="Foundry with XMTPD Node contracts and registrations"
+
+EXPOSE 8545
+
+COPY --from=builder /app/anvil-baked-state anvil-baked-state
+COPY --from=builder /app/contracts.env contracts.env
+
+ENTRYPOINT ["anvil", "--state", "anvil-baked-state"]

dev/docker/anvil-background

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+#!/bin/bash
+
+anvil -p 7545 --dump-state $PWD/anvil-baked-state &