Add Dockerfile, nginx config, and Gitea Actions CI workflow

Multi-stage Docker build produces an Nginx container serving the
static SPA. The CI workflow runs pnpm check on every push and
builds/pushes a Docker image on semver tags.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.gitea/workflows/ci.yml

@@ -0,0 +1,42 @@
+name: CI
+
+on:
+  push:
+    branches: [main]
+    tags: ["*"]
+  pull_request:
+    branches: [main]
+
+jobs:
+  check:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: pnpm/action-setup@v4
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 22
+          cache: pnpm
+
+      - run: pnpm install --frozen-lockfile
+      - run: pnpm check
+
+  build-image:
+    if: startsWith(github.ref, 'refs/tags/')
+    needs: check
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Log in to Gitea registry
+        run: echo "${{ secrets.REGISTRY_PASSWORD }}" | docker login git.bahamut.nitrix.one -u "${{ secrets.REGISTRY_USERNAME }}" --password-stdin
+
+      - name: Build and push
+        run: |
+          IMAGE=git.bahamut.nitrix.one/dostulata/initiative
+          TAG=${GITHUB_REF#refs/tags/}
+          docker build -t $IMAGE:$TAG -t $IMAGE:latest .
+          docker push $IMAGE:$TAG
+          docker push $IMAGE:latest

Dockerfile

@@ -0,0 +1,19 @@
+FROM node:22-slim AS build
+ENV PNPM_HOME="/pnpm"
+ENV PATH="$PNPM_HOME:$PATH"
+RUN corepack enable
+
+WORKDIR /app
+COPY package.json pnpm-lock.yaml pnpm-workspace.yaml ./
+COPY packages/domain/package.json packages/domain/
+COPY packages/application/package.json packages/application/
+COPY apps/web/package.json apps/web/
+RUN pnpm install --frozen-lockfile
+
+COPY . .
+RUN pnpm --filter web build
+
+FROM nginx:alpine
+COPY --from=build /app/apps/web/dist /usr/share/nginx/html
+COPY nginx.conf /etc/nginx/conf.d/default.conf
+EXPOSE 80

nginx.conf

@@ -0,0 +1,9 @@
+server {
+    listen 80;
+    root /usr/share/nginx/html;
+    index index.html;
+
+    location / {
+        try_files $uri $uri/ /index.html;
+    }
+}