services/nomad/apps/popcorn-report.nomad: add nomad job

this component of popcorn reads what statrepo has collected and dumps it
to json every night. these json dumps are used by pqueryd and served by nginx.

services/nomad/apps/popcorn-report.nomad

@@ -0,0 +1,61 @@
+job "popcorn-report" {
+  datacenters = ["VOID"]
+  namespace = "apps"
+  type = "batch"
+
+  periodic {
+    crons = ["@daily"]
+    prohibit_overlap = true
+  }
+
+  group "report" {
+    count = 1
+
+    volume "popcorn_data" {
+      type = "host"
+      source = "popcorn_data"
+      read_only = false
+    }
+
+    task "report" {
+      driver = "docker"
+
+      config {
+        image = "ghcr.io/void-linux/infra-popcorn:TODO"
+        command = "/local/popcorn-report"
+      }
+
+      volume_mount {
+        volume = "popcorn_data"
+        destination = "/data"
+      }
+
+      env {
+        OUTDIR = "/data"
+      }
+
+      template {
+        data = <<EOF
+{{ $allocID := env "NOMAD_ALLOC_ID" -}}
+#!/bin/sh
+{{- range nomadService 1 $allocID "popcorn-statrepo" -}}
+exec popcornctl --server "{{ .Address }}" --port "{{ .Port }}" \
+    report --reset --key "${POPCORN_KEY}" --file "${OUTDIR}/popcorn_$(date +%F).json"
+{{- end -}}
+EOF
+        destination = "local/popcorn-report"
+        perms = "755"
+      }
+
+      template {
+        data = <<EOF
+{{- with nomadVar "nomad/jobs/popcorn" -}}
+POPCORN_KEY={{.reset_key}}
+{{- end -}}
+EOF
+        destination = "secrets/env"
+        env = true
+      }
+    }
+  }
+}