feat(example): simplify docker-compose

For the purposes of showcasing an example, the previous `docker-compose`
was rather excessive running the Pact Broker behind a Nginx proxy with a
PostgreSQL backend. This simplifies the containers to just use the core
Pact broker image and uses `sqlite` for the database.

This commit also drops SSL/TLS from the example as it does not
meaningfully contribute to the example.

Signed-off-by: JP-Ellis <[email protected]>

examples/docker-compose.yml

@@ -0,0 +1,42 @@
+version: "3.9"
+
+services:
+  postgres:
+    image: postgres
+    ports:
+      - "5432:5432"
+    healthcheck:
+      test: psql postgres -U postgres --command 'SELECT 1'
+    environment:
+      POSTGRES_USER: postgres
+      POSTGRES_PASSWORD: postgres
+      POSTGRES_DB: postgres
+
+  broker:
+    image: pactfoundation/pact-broker:latest-multi
+    depends_on:
+      - postgres
+    ports:
+      - "9292:9292"
+    environment:
+      # Basic auth credentials for the Broker
+      PACT_BROKER_ALLOW_PUBLIC_READ: "true"
+      PACT_BROKER_BASIC_AUTH_USERNAME: pactbroker
+      PACT_BROKER_BASIC_AUTH_PASSWORD: pactbroker
+      # Database
+      PACT_BROKER_DATABASE_URL: "postgres://postgres:postgres@postgres/postgres"
+      # PACT_BROKER_DATABASE_URL: sqlite:////tmp/pact_broker.sqlite # Pending pact-foundation/pact-broker-docker#148
+
+    healthcheck:
+      test:
+        [
+          "CMD",
+          "curl",
+          "--silent",
+          "--show-error",
+          "--fail",
+          "http://pactbroker:pactbroker@localhost:9292/diagnostic/status/heartbeat",
+        ]
+      interval: 1s
+      timeout: 2s
+      retries: 5