Add GitHub Actions build and deploy workflows

.github/workflows/ci.yml

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+name: CI
+
+on:
+  push:
+    branches: ["**"]
+  pull_request:
+
+permissions:
+  contents: read
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    env:
+      NEXT_TELEMETRY_DISABLED: "1"
+      DATABASE_URI: postgresql://ci:ci@localhost:5432/ci
+      PAYLOAD_SECRET: ci-only-not-a-real-secret
+      MEETING_SESSION_SECRET: ci-only-not-a-real-secret
+      ANALYTICS_SALT_SECRET: ci-only-not-a-real-secret
+      CRON_SECRET: ci-only-not-a-real-secret
+      NEXT_PUBLIC_SERVER_URL: http://localhost:3000
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Use Node.js 22
+        uses: actions/setup-node@v4
+        with:
+          node-version: 22
+          cache: npm
+      - name: Install dependencies
+        run: npm ci
+      - name: Lint
+        run: npm run lint
+      - name: Typecheck
+        run: npx next typegen && npx tsc --noEmit
+      - name: Test
+        run: npm test
+      - name: Build
+        env:
+          NODE_ENV: production
+        run: npm run build
+
+  build-image:
+    needs: test
+    if: github.ref == 'refs/heads/main' && github.event_name == 'push'
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+    env:
+      IMAGE: git.maro.run/maro/anouma
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Log in to registry
+        uses: docker/login-action@v3
+        with:
+          registry: git.maro.run
+          username: ${{ secrets.REGISTRY_USERNAME }}
+          password: ${{ secrets.REGISTRY_PASSWORD }}
+      - name: Build image
+        run: docker build -t "$IMAGE:$GITHUB_SHA" .
+      - name: Push image
+        run: docker push "$IMAGE:$GITHUB_SHA"

.github/workflows/release.yml

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+name: Release
+
+on:
+  push:
+    tags: ["v*.*.*"]
+
+permissions:
+  contents: read
+
+jobs:
+  promote-and-deploy:
+    runs-on: ubuntu-latest
+    env:
+      IMAGE: git.maro.run/maro/anouma
+    steps:
+      - name: Log in to registry
+        uses: docker/login-action@v3
+        with:
+          registry: git.maro.run
+          username: ${{ secrets.REGISTRY_USERNAME }}
+          password: ${{ secrets.REGISTRY_PASSWORD }}
+      - name: Pull tested image
+        run: docker pull "$IMAGE:$GITHUB_SHA"
+      - name: Promote release image
+        env:
+          VERSION: ${{ github.ref_name }}
+        run: |
+          docker tag "$IMAGE:$GITHUB_SHA" "$IMAGE:$VERSION"
+          docker tag "$IMAGE:$GITHUB_SHA" "$IMAGE:latest"
+          docker push "$IMAGE:$VERSION"
+          docker push "$IMAGE:latest"
+      - name: Deploy to production
+        env:
+          DEPLOY_HOST: ${{ secrets.DEPLOY_HOST }}
+          DEPLOY_PORT: ${{ secrets.DEPLOY_PORT }}
+          DEPLOY_USER: ${{ secrets.DEPLOY_USER }}
+          DEPLOY_SSH_KEY: ${{ secrets.DEPLOY_SSH_KEY }}
+          DEPLOY_HOST_KEY: ${{ secrets.DEPLOY_HOST_KEY }}
+          VERSION: ${{ github.ref_name }}
+        shell: bash
+        run: |
+          set -euo pipefail
+          umask 077
+          key_file="$(mktemp)"
+          known_hosts_file="$(mktemp)"
+          trap 'rm -f "$key_file" "$known_hosts_file"' EXIT
+          printf '%s\n' "$DEPLOY_SSH_KEY" > "$key_file"
+          chmod 600 "$key_file"
+          if [ -n "${DEPLOY_HOST_KEY:-}" ]; then
+            printf '%s\n' "$DEPLOY_HOST_KEY" > "$known_hosts_file"
+          else
+            ssh-keyscan -p "${DEPLOY_PORT:-22}" "$DEPLOY_HOST" > "$known_hosts_file" 2>/dev/null
+          fi
+          ssh -i "$key_file" -o UserKnownHostsFile="$known_hosts_file" -p "${DEPLOY_PORT:-22}" \
+            "${DEPLOY_USER}@${DEPLOY_HOST}" "deploy ${VERSION}"