Add instasync cronjob and plumbing for nodejs on nomad clients.

services/instasync.hcl

@@ -0,0 +1,41 @@
+job "instasync" {
+  datacenters = ["alo"]
+
+  type = "batch"
+
+  periodic {
+    cron = "*/5 * * * *"
+    prohibit_overlap = true
+  }
+
+  group "cron" {
+    volume "code" {
+      type = "host"
+      read_only = true
+      source = "code"
+    }
+    volume "nix-store" {
+      type = "host"
+      read_only = true
+      source = "nix-store"
+    }
+
+    task "sync" {
+      driver = "exec"
+
+      config {
+        command = "/nix/store/2y52nmyfpsq497cppgc43x9v6lkp3q25-nodejs-20.5.1/bin/node"
+        args = ["/code/instasync/sync.js"]
+      }
+
+      volume_mount {
+        volume = "code"
+        destination = "/code"
+      }
+      volume_mount {
+        volume = "nix-store"
+        destination = "/nix/store"
+      }
+    }
+  }
+}