Add Docker image for Emscripten port (#466)

* Add Docker web port image

* Comment out master

* Optimize

* Slim down image

* Revert "Comment out master"

This reverts commit 115c9770e8e01c1a4bc2455eca944d4f7f4c1cf4.

* Allow running from ISO

.github/workflows/docker.yml

@@ -0,0 +1,55 @@
+name: Docker
+
+on:
+  push:
+    branches: ['master']
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}-emscripten
+
+jobs:
+  publish-emscripten:
+    name: Publish web port
+    env:
+        IMAGE_NAME: ${{ github.repository }}-emscripten
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+      attestations: write
+      id-token: write
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Log in to the Container registry
+        uses: docker/login-action@65b78e6e13532edd9afa3aa52ac7964289d1a9c1
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract metadata (tags, labels) for Docker
+        id: meta
+        uses: docker/metadata-action@9ec57ed1fcdbf14dcef7dfbe97b2010124a938b7
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+
+      - name: Build and push Docker image
+        id: push
+        uses: docker/build-push-action@f2a1d5e99d037542a71f64918e516c093c6f3fc4
+        with:
+          file: docker/emscripten/Dockerfile
+          context: .
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+      
+      - name: Generate artifact attestation
+        uses: actions/attest-build-provenance@v2
+        with:
+          subject-name: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME}}
+          subject-digest: ${{ steps.push.outputs.digest }}
+          push-to-registry: true

docker/emscripten/Dockerfile

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+FROM emscripten/emsdk:latest AS builder
+
+ARG CMAKE_VERSION=3.29.3
+
+WORKDIR /src
+
+USER root
+
+RUN apt-get update && apt-get install -y git wget && rm -rf /var/lib/apt/lists/*
+RUN wget https://github.com/Kitware/CMake/releases/download/v${CMAKE_VERSION}/cmake-${CMAKE_VERSION}-Linux-x86_64.sh -O /tmp/cmake.sh && \
+    chmod +x /tmp/cmake.sh && \
+    /tmp/cmake.sh --skip-license --prefix=/usr/local && \
+    rm /tmp/cmake.sh
+
+RUN chown -R emscripten:emscripten /src
+
+USER emscripten
+
+COPY ISLE/emscripten/libwasmfs_fetch.js.patch /tmp/
+RUN cd /emsdk/upstream/emscripten && \
+    git apply --check /tmp/libwasmfs_fetch.js.patch && \
+    git apply /tmp/libwasmfs_fetch.js.patch
+
+COPY --chown=emscripten:emscripten . .
+
+RUN emcmake cmake -S . -B build -DISLE_BUILD_CONFIG=OFF -DISLE_DEBUG=OFF -DCMAKE_BUILD_TYPE=Release -DISLE_EMSCRIPTEN_HOST=/assets && \
+    emmake cmake --build build -j 32
+
+RUN echo "Fetching isle.pizza frontend..."; \
+    git clone --depth 1 https://github.com/isledecomp/isle.pizza /tmp/isle.pizza;
+
+FROM nginx:alpine
+
+COPY docker/emscripten/nginx.conf /etc/nginx/nginx.conf
+COPY --from=builder /tmp/isle.pizza /usr/share/nginx/html
+COPY --from=builder /src/build/isle.* /usr/share/nginx/html
+EXPOSE 6931

docker/emscripten/nginx.conf

@@ -0,0 +1,27 @@
+events {
+  worker_connections 1024;
+}
+
+http {
+  include /etc/nginx/mime.types;
+
+  server {
+    listen 6931;
+    server_name localhost;
+
+    add_header 'Cross-Origin-Embedder-Policy' 'require-corp';
+    add_header 'Cross-Origin-Opener-Policy' 'same-origin';
+    add_header 'Cross-Origin-Resource-Policy' 'cross-origin';
+
+    location / {
+      root /usr/share/nginx/html;
+      index index.html isle.html;
+      try_files $uri $uri/ =404;
+    }
+
+    location ~* ^/assets/(.*)$ {
+      alias /assets/;
+      try_files /$1 /DATA/disk/$1 =404;
+    }
+  }
+}