Restructure project

We previously didn't really had any structure in our project apart
from creating a new folder for each package in our project root.
Now that we have accumulated some packages, we use the well-known
Golang project layout in order to clearly communicate our intent
with packages. See https://github.com/golang-standards/project-layout

deploy/api.tpl.nomad

@@ -0,0 +1,76 @@
+job "${NOMAD_SLUG}" {
+  datacenters = ["dc1"]
+  namespace = "${NOMAD_NAMESPACE}"
+
+  group "api" {
+    count = 1
+
+    update {
+      // https://learn.hashicorp.com/tutorials/nomad/job-rolling-update
+      max_parallel  = 1
+      min_healthy_time  = "30s"
+      healthy_deadline  = "5m"
+      progress_deadline = "10m"
+      auto_revert   = true
+    }
+
+    // Don't allow rescheduling to fail deployment and pipeline if task fails
+    reschedule {
+      attempts = 0
+      unlimited = false
+    }
+
+    // No restarts to immediately fail the deployment and pipeline on first task fail
+    restart {
+      attempts = 0
+    }
+
+    network {
+      mode = "bridge"
+
+      port "http" {
+        to     = 7200
+      }
+    }
+
+    service {
+      # urlprefix- tag allows Fabio to discover this service and proxy traffic correctly
+      tags = ["urlprefix-${HOSTNAME}:80/"]
+      name = "${NOMAD_SLUG}"
+      port = "http"
+
+      // Health check to let Consul know we are alive
+      check {
+        name = "health-check"
+        type = "http"
+        port = "http"
+        path = "/api/v1/health"
+        interval = "10s"
+        timeout  = "2s"
+        check_restart {
+          limit = 3  // auto-restart task when health check fails 3x in a row
+        }
+
+      }
+    }
+
+    task "api" {
+      driver = "docker"
+
+      config {
+        image = "${IMAGE_NAME_ENV}"
+      }
+
+      env {
+        POSEIDON_SERVER_ADDRESS = "${POSEIDON_LISTEN_ADDRESS}"
+        POSEIDON_NOMAD_ADDRESS =  "${NOMAD_SERVER_HOST}"
+        POSEIDON_NOMAD_NAMESPACE = "${NOMAD_NAMESPACE}"
+      }
+
+      resources {
+        memory = "100" // 100 MB RAM
+        cpu    = "100" // 100 MHz
+      }
+    }
+  }
+}