feat: add Docker builds for eth2near

.github/workflows/eth2near-docker.yml

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+name: Build and Push eth2near Docker Image
+
+on:
+  push:
+    branches:
+      - master
+      - main
+    paths:
+      - 'eth2near/**'
+      - 'contracts/near/**'
+      - '.github/workflows/eth2near-docker.yml'
+  release:
+    types: [published]
+  workflow_dispatch:
+
+env:
+  REGISTRY: europe-west4-docker.pkg.dev
+  PROJECT_ID: bridge-misc
+  REPOSITORY: omni-bridge-docker-images
+
+jobs:
+  build-and-push:
+    runs-on: warp-ubuntu-latest-x64-8x
+    permissions:
+      contents: read
+      id-token: write
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v5
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Authenticate to Google Cloud
+        uses: google-github-actions/auth@v2
+        with:
+          credentials_json: ${{ secrets.GCP_SA_KEY }}
+
+      - name: Configure Docker to use gcloud as credential helper
+        run: gcloud auth configure-docker ${{ env.REGISTRY }}
+
+      - name: Extract metadata
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.PROJECT_ID }}/${{ env.REPOSITORY }}/eth2near
+          tags: |
+            type=ref,event=branch
+            type=ref,event=pr
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+            type=semver,pattern={{major}}
+            type=sha,prefix={{branch}}
+            type=raw,value=latest,enable={{is_default_branch}}
+
+      - name: Build and push Docker image
+        id: build
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          file: ./eth2near/Dockerfile
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          platforms: linux/amd64
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+
+      - name: Output image digest
+        run: echo "Image pushed with digest ${{ steps.build.outputs.digest }}"

eth2near/.dockerignore

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+# Rust build artifacts
+target/
+**/*.rs.bk
+
+# IDE files
+.vscode/
+.idea/
+*.swp
+*.swo
+
+# OS files
+.DS_Store
+Thumbs.db
+
+# Git
+.git/
+.gitignore
+
+# Documentation
+README.md
+*.md
+
+# Test files
+tests/
+**/*_test.rs
+
+# Development files
+.env
+.env.local
+.env.*.local
+
+# Logs
+*.log
+
+# Temporary files
+*.tmp
+*.temp

eth2near/Dockerfile

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+# syntax=docker/dockerfile:1
+FROM rust:1.84.0-bookworm AS builder
+
+WORKDIR /app
+
+# Copy everything
+COPY contracts/ ./contracts/
+COPY eth2near/ ./eth2near/
+
+# Build with cache mounts
+WORKDIR /app/eth2near
+RUN --mount=type=cache,target=/usr/local/cargo/registry \
+    --mount=type=cache,target=/usr/local/cargo/git \
+    --mount=type=cache,target=/app/eth2near/target \
+    cargo build --release && \
+    cp target/release/eth2-contract-init /tmp/ && \
+    cp target/release/eth2_to_near_relay /tmp/
+
+# === RUNTIME STAGE ===
+FROM debian:bookworm-slim AS runtime
+
+RUN apt-get update && apt-get install -y \
+    ca-certificates \
+    libssl3 \
+    && rm -rf /var/lib/apt/lists/*
+
+COPY --from=builder /tmp/eth2-contract-init /usr/local/bin/
+COPY --from=builder /tmp/eth2_to_near_relay /usr/local/bin/
+
+RUN useradd -m -u 1001 appuser
+USER appuser
+WORKDIR /app
+
+CMD ["eth2_to_near_relay"]