Add gateway image workflow

Author: sl5-guy

.github/workflows/gateway.yml

@@ -0,0 +1,71 @@
+name: Gateway
+
+on:
+  pull_request:
+  push:
+    branches:
+      - main
+    tags:
+      - "v*"
+  workflow_dispatch:
+
+permissions:
+  contents: read
+  packages: write
+
+env:
+  CARGO_TERM_COLOR: always
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    services:
+      postgres:
+        image: postgres:16
+        env:
+          POSTGRES_DB: agent_gateway_test
+          POSTGRES_USER: agent_gateway_admin
+          POSTGRES_PASSWORD: agent_gateway_dev
+        ports:
+          - 5432:5432
+        options: >-
+          --health-cmd "pg_isready -U agent_gateway_admin -d agent_gateway_test"
+          --health-interval 5s
+          --health-timeout 5s
+          --health-retries 12
+    env:
+      TEST_DATABASE_URL: postgres://agent_gateway_admin:agent_gateway_dev@localhost:5432/agent_gateway_test
+    steps:
+      - uses: actions/checkout@v5
+      - uses: dtolnay/rust-toolchain@stable
+      - uses: Swatinem/rust-cache@v2
+      - run: cargo test --locked
+
+  image:
+    runs-on: ubuntu-latest
+    needs: test
+    if: github.event_name != 'pull_request'
+    steps:
+      - uses: actions/checkout@v5
+      - uses: docker/setup-buildx-action@v3
+      - uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+          tags: |
+            type=ref,event=branch
+            type=ref,event=tag
+            type=sha
+      - uses: docker/build-push-action@v6
+        with:
+          context: .
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}