Add integration test.

example/redis.nomad

@@ -6,9 +6,10 @@ job "redis" {
       driver = "containerd-driver"
 
       config {
-        image   = "redis:alpine"
-        seccomp = true
-        cwd     = "/home/redis"
+        image    = "redis:alpine"
+        hostname = "foobar"
+        seccomp  = true
+        cwd      = "/home/redis"
       }
 
       resources {

tests/001-test-redis.sh

@@ -34,6 +34,13 @@ test_redis_nomad_job() {
         exit 1
     fi
 
+    echo "INFO: Exec redis job and check hostname is foobar."
+    hostname=$(nomad alloc exec -job redis hostname)
+    if [ $hostname != "foobar" ]; then
+        echo "ERROR: hostname is not foobar."
+        exit 1
+    fi
+
     echo "INFO: Check if default seccomp is enabled."
     output=$(nomad alloc exec -job redis cat /proc/1/status | grep Seccomp)
     seccomp_code=$(echo $output|cut -d' ' -f2)