Add slim Phase 1 task 1.11 (Dockerfile + Gitea workflow) for pilot deploy

- Multi-stage Dockerfile (Node 22 alpine, BuildKit cache, non-root user).
  HEALTHCHECK and metrics port (9090) deferred until task 1.10 ships;
  comments document the resume.
- .gitea/workflows/build.yml — single build job following the pattern
  of other TRM repos (no services/container, ubuntu-latest direct).
  Tests + typecheck + lint inline; image tagged :main.
- compose.dev.yaml — local-build variant for verifying Dockerfile
  changes pre-push. Production deploy lives in the sibling deploy/ repo.
- .env.example documenting all runtime env vars.
- README updated to point at deploy/ for production and explain CI.
- Task 1.11 marked done (slim variant) in ROADMAP and task file.

.gitea/workflows/build.yml

@@ -0,0 +1,69 @@
+name: Build and Push tcp-ingestion
+
+on:
+  push:
+    branches: [main]
+    paths:
+      - 'src/**'
+      - 'test/**'
+      - 'package.json'
+      - 'pnpm-lock.yaml'
+      - 'tsconfig.json'
+      - 'tsconfig.test.json'
+      - 'vitest.config.ts'
+      - 'eslint.config.js'
+      - 'Dockerfile'
+      - '.dockerignore'
+      - '.gitea/workflows/build.yml'
+  workflow_dispatch:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up Node 22
+        uses: actions/setup-node@v4
+        with:
+          node-version: 22
+
+      - name: Enable pnpm
+        run: corepack enable && corepack prepare pnpm@latest-9 --activate
+
+      - name: Install dependencies
+        run: pnpm install --frozen-lockfile
+
+      - name: Typecheck
+        run: pnpm typecheck
+
+      - name: Lint
+        run: pnpm lint
+
+      - name: Test
+        run: pnpm test
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+        with:
+          driver: docker-container
+
+      - name: Login to Gitea Registry
+        uses: docker/login-action@v3
+        with:
+          registry: git.dev.microservices.al
+          username: ${{ secrets.REGISTRY_USERNAME }}
+          password: ${{ secrets.REGISTRY_PASSWORD }}
+
+      - name: Build and Push
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          push: true
+          tags: git.dev.microservices.al/trm/tcp-ingestion:main
+
+      # Uncomment when a Portainer webhook is configured for auto-deploy.
+      # - name: Trigger Portainer Deploy
+      #   if: success()
+      #   run: curl -X POST "${{ secrets.PORTAINER_WEBHOOK_URL }}"