feat: setup free Docker and GHCR deployment

Author: Anant Kumar

.github/workflows/docker-publish.yml

@@ -0,0 +1,51 @@
+name: Build and Publish Docker Image to GHCR
+
+on:
+  push:
+    branches: [ "main" ]
+  workflow_dispatch:
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}
+
+jobs:
+  build-and-push:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Log in to the Container registry
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract metadata (tags, labels) for Docker
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+          tags: |
+            type=raw,value=latest
+            type=ref,event=branch
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          file: ./Dockerfile
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max

Dockerfile

@@ -0,0 +1,36 @@
+# Multi-stage production Dockerfile
+# Combines WASM client and Axum server on a single port.
+
+# 1. Build the WASM frontend
+FROM rust:1.89-bookworm AS wasm-builder
+RUN rustup target add wasm32-unknown-unknown
+RUN cargo install trunk --locked
+WORKDIR /app
+COPY Cargo.toml Cargo.lock ./
+COPY crates ./crates
+COPY apps ./apps
+RUN cd crates/client && trunk build --release
+
+# 2. Build the Axum backend server
+FROM rust:1.89-bookworm AS server-builder
+WORKDIR /app
+COPY Cargo.toml Cargo.lock ./
+COPY crates ./crates
+COPY apps ./apps
+COPY --from=wasm-builder /app/dist ./dist
+RUN cargo build --release -p excaildraw-server
+
+# 3. Create the final lightweight runtime image
+FROM debian:bookworm-slim
+RUN apt-get update && apt-get install -y ca-certificates && rm -rf /var/lib/apt/lists/*
+
+COPY --from=server-builder /app/target/release/excaildraw-server /usr/local/bin/
+COPY --from=wasm-builder /app/dist /app/dist
+
+# Default to 7860 for compatibility with Hugging Face Spaces.
+# This environment variable can be overridden at runtime.
+ENV PORT=7860
+ENV FRONTEND_DIST=/app/dist
+EXPOSE 7860
+
+CMD ["excaildraw-server"]

crates/client/src/collab.rs

@@ -8,6 +8,9 @@ use wasm_bindgen::JsCast;
 use web_sys::{MessageEvent, WebSocket};
 
 fn api_base() -> String {
+    if let Some(url) = option_env!("API_BASE_URL") {
+        return url.to_string();
+    }
     web_sys::window()
         .and_then(|w| w.location().origin().ok())
         .filter(|origin| !origin.ends_with(":3000"))