feat: Publish Docker images on release

.github/workflows/release-please.yml

@@ -8,12 +8,57 @@ on:
 permissions:
   contents: write
   pull-requests: write
+  packages: write
 
 jobs:
   release-please:
     runs-on: ubuntu-latest
+    outputs:
+      release_created: ${{ steps.release.outputs.release_created }}
+      tag_name: ${{ steps.release.outputs.tag_name }}
+      version: ${{ steps.release.outputs.version }}
     steps:
       - uses: googleapis/release-please-action@v4
+        id: release
         with:
           release-type: python
           package-name: adcp-sales-agent
+
+  publish-docker:
+    needs: release-please
+    if: ${{ needs.release-please.outputs.release_created }}
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Log in to GitHub Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract metadata for Docker
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ghcr.io/${{ github.repository }}
+          tags: |
+            type=semver,pattern={{version}},value=${{ needs.release-please.outputs.version }}
+            type=semver,pattern={{major}}.{{minor}},value=${{ needs.release-please.outputs.version }}
+            type=semver,pattern={{major}},value=${{ needs.release-please.outputs.version }}
+            type=raw,value=latest
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          file: Dockerfile.fly
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max

fly.toml

@@ -2,14 +2,22 @@
 #
 # See https://fly.io/docs/reference/configuration/ for information about how to use this file.
 #
+# Port Architecture:
+#   - Port 8000: nginx reverse proxy (external-facing, what Fly routes to)
+#   - Port 8080: MCP server (internal, behind nginx)
+#   - Port 8001: Admin UI (internal, behind nginx)
+#   - Port 8091: A2A server (internal, behind nginx)
+#
+# The *_PORT env vars configure where internal services bind. nginx proxies
+# external requests on 8000 to the appropriate internal service by path.
 
 app = "adcp-sales-agent"
 primary_region = "iad"
 
 [build]
   dockerfile = "Dockerfile.fly"
 
-# Single unified service exposed via nginx
+# nginx proxy - routes to internal services by path
 [[services]]
   internal_port = 8000
   protocol = "tcp"