feat: initialize azure-acme-provisioner project with core functionality

- Add package.json for project metadata and dependencies
- Implement CLI in src/cli.ts for managing SSL/TLS certificates
- Create Azure Functions host configuration in src/function/host.json
- Set up timer function in src/function/index.ts for scheduled certificate management
- Define configuration loading and error handling in src/lib/config.ts
- Implement DNS zone scanning and challenge management in src/lib/dns.ts
- Develop ACME client for certificate issuance in src/lib/acme.ts
- Create KeyVault store for managing secrets and certificates in src/lib/keyvault.ts
- Implement provisioning logic in src/lib/provisioner.ts for issuing and renewing certificates
- Add TypeScript configuration files for building the project

src/function/host.json

@@ -0,0 +1,21 @@
+{
+  "version": "2.0",
+  "logging": {
+    "applicationInsights": {
+      "samplingSettings": {
+        "isEnabled": true,
+        "excludedTypes": "Request"
+      }
+    },
+    "logLevel": {
+      "default": "Information",
+      "Host.Results": "Error",
+      "Function": "Information",
+      "Host.Aggregator": "Trace"
+    }
+  },
+  "extensionBundle": {
+    "id": "Microsoft.Azure.Functions.ExtensionBundle",
+    "version": "[4.*, 5.0.0)"
+  }
+}

src/function/index.ts

@@ -0,0 +1,18 @@
+import { app, InvocationContext, Timer } from '@azure/functions';
+import { loadConfig } from '../lib/config.js';
+import { Provisioner } from '../lib/provisioner.js';
+
+app.timer('acmeProvisioner', {
+  schedule: '0 0 2 * * *',
+  useMonitor: true,
+  handler: async (_timer: Timer, context: InvocationContext): Promise<void> => {
+    context.log('Azure ACME Provisioner starting');
+    const config = loadConfig();
+    const provisioner = new Provisioner(config, context.log.bind(context));
+    const result = await provisioner.run();
+    context.log('Provisioning complete', result);
+    if (result.errors.length > 0) {
+      throw new Error(`${result.errors.length} domain(s) failed — see logs for details`);
+    }
+  },
+});