feat: add PawSQL docs examples and image CI

examples/Barkfile

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+pawsql {
+    listen :5432
+
+    tls {
+        cert /etc/pawsql/tls/fullchain.pem
+        key /etc/pawsql/tls/privkey.pem
+    }
+
+    database bark_bistro {
+        hostname bistro.pawsql.test
+        upstream bark-bistro:5432
+    }
+
+    database wagging_tail {
+        hostname tail.pawsql.test
+        upstream wagging-tail:5432
+    }
+}

examples/docker-compose.yml

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+services:
+  certificates:
+    image: alpine/openssl:latest
+    command:
+      - sh
+      - -ec
+      - >-
+        openssl req -x509 -newkey rsa:2048 -nodes -days 7
+        -keyout /certs/privkey.pem -out /certs/fullchain.pem
+        -subj /CN=*.pawsql.test
+    volumes:
+      - certificates:/certs
+
+  pawsql:
+    build: ..
+    depends_on:
+      certificates:
+        condition: service_completed_successfully
+      bark-bistro:
+        condition: service_started
+      wagging-tail:
+        condition: service_started
+    ports:
+      - "5432:5432"
+    volumes:
+      - ./Barkfile:/etc/pawsql/Barkfile:ro
+      - certificates:/etc/pawsql/tls:ro
+    networks:
+      default:
+        aliases:
+          - bistro.pawsql.test
+          - tail.pawsql.test
+
+  bark-bistro:
+    image: postgres:17-alpine
+    environment:
+      POSTGRES_DB: bark_bistro
+      POSTGRES_USER: bark_bistro
+      POSTGRES_PASSWORD: example-only
+
+  wagging-tail:
+    image: postgres:17-alpine
+    environment:
+      POSTGRES_DB: wagging_tail
+      POSTGRES_USER: wagging_tail
+      POSTGRES_PASSWORD: example-only
+
+volumes:
+  certificates: