Add a test to ensure client IP is logged

nginx/tests/ServiceLogsClientIp/build.gradle.kts

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+import plugins.TestsPlugin.DockerComposeUp
+import java.io.ByteArrayOutputStream
+
+tasks.named<DockerComposeUp>("test") {
+    doLast {
+        // get the docker logs from our nginx service
+        val outputStream = ByteArrayOutputStream()
+        project.exec {
+            commandLine = baseArguments + listOf("logs")
+            standardOutput = outputStream
+            workingDir = project.projectDir
+        }
+        val output = outputStream.toString()
+
+        // see if the log has a match for the IP we set in the test.sh cURL -H command
+        val pattern = "nginx-1  | 1.2.3.4"
+        val matchingLines = output.lines().filter { line ->
+            line.startsWith(pattern)
+        }
+
+        // fail the test if we didn't find any logs with the IP
+        if (matchingLines.isEmpty()) {
+            throw GradleException("No lines found starting with '$pattern'")
+        }
+    }
+}

nginx/tests/ServiceLogsClientIp/docker-compose.yml

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+---
+version: "3.8"
+
+# Common to all services
+x-common: &common
+  restart: "no"
+
+name: nginx-servicelogsclientip
+services:
+  nginx:
+    <<: *common
+    image: ${NGINX:-islandora/nginx:local}
+    # Set realip as trusting only localhost
+    environment:
+      - NGINX_REAL_IP_HEADER=X-Forwarded-For
+      - NGINX_SET_REAL_IP_FROM=127.0.0.1/32
+    volumes:
+      - ./test.sh:/test.sh
+    command:
+      - /test.sh

nginx/tests/ServiceLogsClientIp/test.sh

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+#!/command/with-contenv bash
+# shellcheck shell=bash
+
+set -eou pipefail
+
+# Wait for Nginx to be ready.
+s6-svwait -U /run/service/nginx
+
+# hit localhost nginx with the proper header so that IP is logged
+curl -s -o /dev/null -H "X-Forwarded-For: 1.2.3.4" http://localhost:80/
+
+# Service must start for us to get to this point.
+exit 0