feat(infra): add docker image build and deploy pipeline (#13)

.github/workflows/ci.yml

@@ -101,3 +101,36 @@ jobs:
         run: |
           terraform -chdir=infra/terraform init -backend=false
           terraform -chdir=infra/terraform validate
+
+  images:
+    name: Docker / build ${{ matrix.service }}
+    runs-on: ubuntu-latest
+    timeout-minutes: 20
+    strategy:
+      fail-fast: false
+      matrix:
+        service:
+          - bot
+          - miniapp
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Build container image
+        run: |
+          case "${{ matrix.service }}" in
+            bot)
+              docker build -f apps/bot/Dockerfile -t household-bot:ci .
+              ;;
+            miniapp)
+              docker build -f apps/miniapp/Dockerfile -t household-miniapp:ci .
+              ;;
+            *)
+              echo "Unknown service: ${{ matrix.service }}"
+              exit 1
+              ;;
+          esac