feat: publish standalone worker

Separate worker packaging and service lifecycle from the control plane.

internal/webapp/templates/overview.html

@@ -0,0 +1,56 @@
+{{define "body"}}<section class="card">
+  <h1>Overview</h1>
+  <div class="cards">
+    <div class="metric">
+      <div class="label">Worker ID</div>
+      <div class="value">{{.WorkerID}}</div>
+    </div>
+    <div class="metric">
+      <div class="label">Region</div>
+      <div class="value">{{.RegionCode}}</div>
+    </div>
+    <div class="metric">
+      <div class="label">State</div>
+      <div class="value">{{.WorkerState}}</div>
+    </div>
+    <div class="metric">
+      <div class="label">Last heartbeat ack</div>
+      <div class="value">{{fmtTime .LastAckAt}}</div>
+    </div>
+    <div class="metric">
+      <div class="label">Discovered apps</div>
+      <div class="value">{{.DiscoveredCount}}</div>
+    </div>
+    <div class="metric">
+      <div class="label">Checks (last 1000)</div>
+      <div class="value">{{.ResultCount}}</div>
+    </div>
+    <div class="metric">
+      <div class="label">Notifications (last 1000)</div>
+      <div class="value">{{.NotifCount}}</div>
+    </div>
+    <div class="metric">
+      <div class="label">CPU</div>
+      <div class="value">{{fmtPercent .Snapshot.CPU.TotalPct}}</div>
+    </div>
+    <div class="metric">
+      <div class="label">Memory used</div>
+      <div class="value">{{fmtPercent .Snapshot.Memory.UsedPct}}</div>
+    </div>
+    <div class="metric">
+      <div class="label">Uptime</div>
+      <div class="value">{{fmtDuration .Snapshot.Uptime}}</div>
+    </div>
+    <div class="metric">
+      <div class="label">Load (1/5/15)</div>
+      <div class="value">{{printf "%.2f / %.2f / %.2f" .Snapshot.Load.One .Snapshot.Load.Five .Snapshot.Load.Fifteen}}</div>
+    </div>
+  </div>
+</section>
+
+<section class="card">
+  <h2>Recent log lines</h2>
+  <pre class="log">{{range .LogTail}}{{.}}
+{{end}}</pre>
+  <p><a href="/logs">View all logs</a></p>
+</section>{{end}}