Add Pulumi for tailnet IaC management (#15)

## Summary
- Manage tail8d86e.ts.net ACLs, tags, and DNS via Pulumi + Python
- State stored in Pulumi Cloud (free tier) to avoid circular dependency
- OAuth authentication via 1Password for secure credential management
- New mise tasks: `tailnet-preview`, `tailnet-up`

## Architecture
Two-layer approach:
- **Layer 1 (Pulumi)**: Tailnet-wide config (ACLs, tags, DNS)
- **Layer 2 (Ansible)**: Node-local `tailscale serve` config (unchanged)

## Test plan
- [x] Exported current ACL from Tailscale API
- [x] Imported existing ACL into Pulumi state
- [x] Verified `mise run tailnet-preview` shows no changes
- [x] Verified `mise run tailnet-up` applies successfully

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Reviewed-on: https://forge.tail8d86e.ts.net/eblume/blumeops/pulls/15

pulumi/.gitignore

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+# Python
+.venv/
+__pycache__/
+*.py[cod]
+
+# uv
+uv.lock
+
+# Pulumi
+*.pyc

pulumi/Pulumi.tail8d86e.yaml

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+config:
+  tailscale:tailnet: tail8d86e.ts.net

pulumi/Pulumi.yaml

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+name: blumeops-tailnet
+runtime:
+  name: python
+  options:
+    toolchain: uv
+description: Tailnet configuration for tail8d86e.ts.net

pulumi/__main__.py

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+"""Pulumi program to manage tail8d86e.ts.net tailnet configuration."""
+
+import pulumi
+import pulumi_tailscale as tailscale
+from pathlib import Path
+
+# Read the HuJSON policy file
+policy_path = Path(__file__).parent / "policy.hujson"
+policy_content = policy_path.read_text()
+
+# Manage the ACL - this completely overwrites the tailnet's ACL policy
+acl = tailscale.Acl(
+    "tailnet-acl",
+    acl=policy_content,
+)
+
+# Export useful info
+pulumi.export("acl_id", acl.id)

pulumi/policy.hujson

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+// Example/default ACLs for unrestricted connections.
+{
+	// Declare static groups of users. Use autogroups for all users or users with a specific role.
+	// "groups": {
+	//   "group:example": ["alice@example.com", "bob@example.com"],
+	// },
+
+	// Define the tags which can be applied to devices and by which users.
+	// "tagOwners": {
+	//   "tag:example": ["autogroup:admin"],
+	// },
+
+	// Define grants that govern access for users, groups, autogroups, tags,
+	// Tailscale IP addresses, and subnet ranges.
+	"grants": [
+		// Allow all connections.
+		// Comment this section out if you want to define specific restrictions.
+		{
+			"src": ["*"],
+			"dst": ["*"],
+			"ip":  ["*"],
+		},
+
+		// Allow users in "group:example" to access "tag:example", but only from
+		// devices that are running macOS and have enabled Tailscale client auto-updating.
+		// {"src": ["group:example"], "dst": ["tag:example"], "ip": ["*"], "srcPosture":["posture:autoUpdateMac"]},
+	],
+
+	// Define postures that will be applied to all rules without any specific
+	// srcPosture definition.
+	// "defaultSrcPosture": [
+	//      "posture:anyMac",
+	// ],
+
+	// Define device posture rules requiring devices to meet
+	// certain criteria to access parts of your system.
+	// "postures": {
+	//      // Require devices running macOS, a stable Tailscale
+	//      // version and auto update enabled for Tailscale.
+	//  "posture:autoUpdateMac": [
+	//      "node:os == 'macos'",
+	//      "node:tsReleaseTrack == 'stable'",
+	//      "node:tsAutoUpdate",
+	//  ],
+	//      // Require devices running macOS and a stable
+	//      // Tailscale version.
+	//  "posture:anyMac": [
+	//      "node:os == 'macos'",
+	//      "node:tsReleaseTrack == 'stable'",
+	//  ],
+	// },
+
+	// Define users and devices that can use Tailscale SSH.
+	"ssh": [
+		// Allow all users to SSH into their own devices in check mode.
+		// Comment this section out if you want to define specific restrictions.
+		{
+			"action": "check",
+			"src":    ["autogroup:member"],
+			"dst":    ["autogroup:self"],
+			"users":  ["autogroup:nonroot", "root"],
+		},
+		// Allow Erich to ssh on to the homelab server.
+		{
+			"src":         ["blume.erich@gmail.com"],
+			"dst":         ["tag:homelab"],
+			"users":       ["autogroup:nonroot"],
+			"action":      "check",
+			"checkPeriod": "12h0m0s",
+		},
+	],
+
+	"tagOwners": {
+		// Grafana service host tag
+		"tag:grafana": ["autogroup:admin"],
+
+		// This tag applies to instances which are meant to be accessible in my homelab. These instances can be SSH'ed in to by any member of the admin autogroup.
+		"tag:homelab": ["autogroup:admin"],
+
+		// Kiwix, a local wiki server. I use it to create mirrors of wikipedia.
+		"tag:kiwix": ["autogroup:admin"],
+
+		// Service tag for forgejo, scm host and code forge
+		"tag:forge": ["autogroup:admin"],
+
+		// devpi pypi index
+		"tag:devpi": ["autogroup:admin"],
+
+		// Loki log collection
+		"tag:loki": ["autogroup:admin"],
+
+		// This tag is applied to resources modified by blumeops-pulumi IaC
+		"tag:blumeops": ["autogroup:admin"],
+	},
+
+	// Test access rules every time they're saved.
+	// "tests": [
+	//   {
+	//       "src": "alice@example.com",
+	//       "accept": ["tag:example"],
+	//       "deny": ["100.101.102.103:443"],
+	//   },
+	// ],
+}

pulumi/pyproject.toml

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+[project]
+name = "blumeops-tailnet"
+version = "0.1.0"
+requires-python = ">=3.11"
+dependencies = [
+    "pulumi>=3.0.0",
+    "pulumi-tailscale>=0.24.0",
+]