build: add Docker and CI/CD pipeline for web deployment

- Add multi-stage Dockerfile (Flutter build → nginx:alpine)
- Add nginx.conf with SPA routing, gzip, and caching
- Add Gitea workflow for release-triggered builds
- Document release procedure in AGENTS.md

Deploys to port 8092, auto-updates via Watchtower.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.gitea/workflows/build.yml

@@ -0,0 +1,34 @@
+name: Build and Push
+
+on:
+  release:
+    types: [published]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Login to Gitea Registry
+        uses: docker/login-action@v3
+        with:
+          registry: git.schweitz.internal
+          username: ${{ secrets.REGISTRY_USER }}
+          password: ${{ secrets.REGISTRY_PASSWORD }}
+
+      - name: Build and push
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          push: true
+          tags: |
+            git.schweitz.internal/jpmschweitzer/tatlock-ui:latest
+            git.schweitz.internal/jpmschweitzer/tatlock-ui:${{ github.ref_name }}
+
+      - name: Trigger Watchtower update
+        if: success()
+        run: |
+          curl -sf -H "Authorization: Bearer ${{ secrets.WATCHTOWER_TOKEN }}" \
+            http://watchtower:8080/v1/update

AGENTS.md

@@ -42,7 +42,36 @@ This document contains instructions and documentation references for AI assistan
     * Tag after updating `pubspec.yaml` version and CHANGELOG
     * Push tags with `git push --tags`
 
+### 🚀 Release Procedure
+
+This project uses version-tag-based CI/CD. Releases trigger automated Docker builds and deployments.
+
+**Release Steps:**
+
+1. Update version in `pubspec.yaml` (bump major.minor.patch, not build number)
+2. Update `CHANGELOG.md` with changes under `## [x.x.x] - YYYY-MM-DD`
+3. Commit changes: `git commit -m "chore: release vX.X.X"`
+4. Create git tag: `git tag vX.X.X`
+5. Push with tags: `git push origin master --tags`
+6. Create release in Gitea UI (git.schweitz.net → Releases → New Release)
+   * Select the tag
+   * Add release notes (can copy from CHANGELOG)
+   * **Publish** the release (this triggers CI/CD)
+
+**What happens on release:**
+
+* Gitea CI builds Flutter web app in Docker
+* Image pushed to `git.schweitz.internal/jpmschweitzer/tatlock-ui:latest` and `:vX.X.X`
+* Watchtower detects new image and auto-updates running container
+* App available at `http://tower:8092` (and eventually `home.schweitz.net`)
+
+**Rollback:**
+
+* In Portainer, update image tag to previous version (e.g., `:v0.2.0`)
+* Or: `docker pull git.schweitz.internal/jpmschweitzer/tatlock-ui:v0.2.0`
+
 ### 🧪 Testing Requirements
+
 * **Always add tests for new code before committing.** No exceptions.
 * Tests should cover the happy path and key edge cases.
 * Run `flutter test` before committing to ensure all tests pass.
@@ -50,6 +79,7 @@ This document contains instructions and documentation references for AI assistan
 * Code coverage should not decrease with new commits.
 
 ### 📝 Changelog Maintenance
+
 * **Update `CHANGELOG.md`** with every user-facing change.
 * Format: `## [Unreleased] - YYYY-MM-DD` followed by `### Added`, `### Changed`, or `### Fixed`.
 

Dockerfile

@@ -0,0 +1,41 @@
+# Stage 1: Build Flutter web application
+FROM ghcr.io/cirruslabs/flutter:stable AS builder
+
+WORKDIR /app
+
+# Copy dependency files first for better caching
+COPY pubspec.yaml pubspec.lock ./
+
+# Get dependencies
+RUN flutter pub get
+
+# Copy the rest of the application
+COPY . .
+
+# Generate code with build_runner
+RUN dart run build_runner build --delete-conflicting-outputs
+
+# Build for web release
+RUN flutter build web --release
+
+# Stage 2: Serve with nginx
+FROM nginx:alpine
+
+# Install curl for healthcheck
+RUN apk add --no-cache curl
+
+# Copy custom nginx configuration
+COPY nginx.conf /etc/nginx/nginx.conf
+
+# Copy built web app to nginx html directory
+COPY --from=builder /app/build/web /usr/share/nginx/html
+
+# Expose port 80
+EXPOSE 80
+
+# Health check
+HEALTHCHECK --interval=30s --timeout=10s --start-period=5s --retries=3 \
+  CMD curl -f http://localhost:80/ || exit 1
+
+# Run nginx in foreground
+CMD ["nginx", "-g", "daemon off;"]

nginx.conf

@@ -0,0 +1,87 @@
+worker_processes auto;
+error_log /var/log/nginx/error.log warn;
+pid /var/run/nginx.pid;
+
+events {
+    worker_connections 1024;
+}
+
+http {
+    include /etc/nginx/mime.types;
+    default_type application/octet-stream;
+
+    log_format main '$remote_addr - $remote_user [$time_local] "$request" '
+                    '$status $body_bytes_sent "$http_referer" '
+                    '"$http_user_agent" "$http_x_forwarded_for"';
+
+    access_log /var/log/nginx/access.log main;
+
+    sendfile on;
+    tcp_nopush on;
+    tcp_nodelay on;
+    keepalive_timeout 65;
+    types_hash_max_size 2048;
+
+    # Gzip compression
+    gzip on;
+    gzip_vary on;
+    gzip_proxied any;
+    gzip_comp_level 6;
+    gzip_min_length 1000;
+    gzip_types
+        text/plain
+        text/css
+        text/javascript
+        application/javascript
+        application/json
+        application/x-javascript
+        application/xml
+        application/xml+rss
+        image/svg+xml
+        font/woff
+        font/woff2;
+
+    server {
+        listen 80;
+        server_name _;
+        root /usr/share/nginx/html;
+        index index.html;
+
+        # Security headers
+        add_header X-Frame-Options "SAMEORIGIN" always;
+        add_header X-Content-Type-Options "nosniff" always;
+        add_header X-XSS-Protection "1; mode=block" always;
+
+        # SPA routing: all routes fall back to index.html
+        location / {
+            try_files $uri $uri/ /index.html;
+        }
+
+        # No cache for index.html (ensures updates are picked up)
+        location = /index.html {
+            add_header Cache-Control "no-cache, no-store, must-revalidate";
+            add_header Pragma "no-cache";
+            add_header Expires "0";
+        }
+
+        # Long cache for Flutter assets (content-hash naming ensures freshness)
+        location ~* \.(js|css|woff|woff2|ttf|eot|ico|png|jpg|jpeg|gif|svg|webp)$ {
+            expires 1y;
+            add_header Cache-Control "public, immutable";
+            access_log off;
+        }
+
+        # Cache manifest and version files briefly
+        location ~* \.(json|webmanifest)$ {
+            expires 1h;
+            add_header Cache-Control "public";
+        }
+
+        # Health check endpoint
+        location /health {
+            access_log off;
+            return 200 "OK";
+            add_header Content-Type text/plain;
+        }
+    }
+}