Add Docker deployment, matching Djupet's setup

Multi-stage build (node build -> nginx:alpine serve), docker-compose
with a configurable HOST_PORT (default 47174, an unusual port left
free for nginx proxy manager to front later), and a Gitea Actions
workflow that builds/pushes the image on push to main.

Verified: image builds, container serves the app and all art assets
on port 47174.

.dockerignore

@@ -0,0 +1,9 @@
+node_modules
+**/node_modules
+dist
+**/dist
+.git
+.env
+.env.example
+*.log
+data

.env.example

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+# Copy to .env to override docker-compose.yml defaults
+HOST_PORT=47174
+IMAGE=repo.explewd.com/explewd/vildhjarta:latest

.gitea/workflows/build.yml

@@ -0,0 +1,57 @@
+name: Docker
+
+on:
+  push:
+    branches: [main]
+  workflow_dispatch:
+
+jobs:
+  build-and-push:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Derive image name and tags
+        id: meta
+        shell: bash
+        run: |
+          set -euo pipefail
+
+          SERVER_URL="${GITHUB_SERVER_URL:-${GITEA_SERVER_URL:-}}"
+          REPO="${GITHUB_REPOSITORY:-${GITEA_REPOSITORY:-}}"
+          SHA="${GITHUB_SHA:-${GITEA_SHA:-}}"
+
+          if [[ -z "${SERVER_URL}" || -z "${REPO}" || -z "${SHA}" ]]; then
+            echo "Missing SERVER_URL/REPO/SHA env vars." >&2
+            echo "SERVER_URL='${SERVER_URL}' REPO='${REPO}' SHA='${SHA}'" >&2
+            exit 1
+          fi
+
+          HOST=$(echo "${SERVER_URL}" | sed 's|https://||;s|http://||')
+          IMAGE=$(echo "${HOST}/${REPO}" | tr '[:upper:]' '[:lower:]')
+          SHORT_SHA=$(echo "${SHA}" | cut -c1-7)
+
+          echo "host=${HOST}" >> "$GITHUB_OUTPUT"
+          echo "image=${IMAGE}" >> "$GITHUB_OUTPUT"
+          echo "short_sha=${SHORT_SHA}" >> "$GITHUB_OUTPUT"
+
+      - name: Log in to Gitea container registry
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ steps.meta.outputs.host }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.TKNTKN }}
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Build and push
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          file: Dockerfile
+          push: true
+          tags: |
+            ${{ steps.meta.outputs.image }}:latest
+            ${{ steps.meta.outputs.image }}:${{ steps.meta.outputs.short_sha }}

Dockerfile

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+FROM node:22-alpine AS build
+WORKDIR /app
+COPY package.json ./
+RUN npm install
+COPY . .
+RUN npm run build
+
+FROM nginx:alpine
+COPY --from=build /app/dist /usr/share/nginx/html
+COPY nginx.conf /etc/nginx/conf.d/default.conf
+EXPOSE 80

docker-compose.yml

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+services:
+  app:
+    image: ${IMAGE:-vildhjarta:local}
+    restart: unless-stopped
+    ports:
+      - "${HOST_PORT:-47174}:80"

nginx.conf

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+server {
+    listen 80;
+    root /usr/share/nginx/html;
+    index index.html;
+    location / {
+        try_files $uri $uri/ /index.html;
+    }
+    gzip on;
+    gzip_types text/css application/javascript application/json image/svg+xml;
+}