Add proxy store example

docker/gaffer-rest/proxy-example/config/operationsDeclarations.json

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+{
+    "operations": [
+        {
+            "operation": "uk.gov.gchq.gaffer.proxystore.operation.GetProxyUrl",
+            "handler": {
+                "class": "uk.gov.gchq.gaffer.proxystore.operation.handler.GetProxyUrlHandler"
+            }
+        },
+        {
+            "operation": "uk.gov.gchq.gaffer.proxystore.operation.GetProxyProperties",
+            "handler": {
+                "class": "uk.gov.gchq.gaffer.proxystore.operation.handler.GetProxyPropertiesHandler"
+            }
+        }
+    ]
+}

docker/gaffer-rest/proxy-example/config/store.properties

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+# Copyright 2024 Crown Copyright
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+gaffer.store.properties.class=uk.gov.gchq.gaffer.proxystore.ProxyProperties
+gaffer.store.class=uk.gov.gchq.gaffer.proxystore.ProxyStore
+gaffer.store.operation.declarations=/gaffer/store/operationsDeclarations.json
+
+# Proxy config
+gaffer.host=gaffer-rest
+gaffer.port=8080
+gaffer.context-root=/rest

docker/gaffer-rest/proxy-example/docker-compose.yaml

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+# Copyright 2024 Crown Copyright
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+services:
+
+  gaffer-rest:
+    image: gchq/gaffer-rest:${GAFFER_VERSION}-accumulo-${ACCUMULO_VERSION}
+    healthcheck:
+      test: sleep 15
+      timeout: 20s
+    restart: always
+
+  gaffer-rest-proxy:
+    image: gchq/gaffer-rest:${GAFFER_VERSION}-accumulo-${ACCUMULO_VERSION}
+    depends_on:
+      gaffer-rest:
+        condition: service_healthy
+    restart: always
+    ports:
+    - 8080:8080
+    volumes:
+    - ./config/store.properties:/gaffer/store/store.properties:ro
+    - ./config/operationsDeclarations.json:/gaffer/store/operationsDeclarations.json:ro