feat: add firewall steps

kcl/lib/steps/azure/firewall.k

@@ -0,0 +1,51 @@
+import azure_pipelines.ap.steps
+
+CreateFirewall = lambda serviceConnection: str, subscription: str, resourceGroup: str, name: str, location: str, vnetName: str, publicIpName: str, exportVar: str = "FWPRIVATE_IP" -> steps.Step {
+    script = """
+az extension add --name azure-firewall
+
+az network public-ip create \\
+  --resource-group "${resourceGroup}" \\
+  --name "${publicIpName}" \\
+  --sku Standard \\
+  --location "${location}" \\
+  --subscription "${subscription}"
+
+az network firewall create \\
+  --resource-group "${resourceGroup}" \\
+  --name "${name}" \\
+  --location "${location}" \\
+  --enable-dns-proxy true \\
+  --subscription "${subscription}"
+
+az network firewall ip-config create \\
+  --resource-group "${resourceGroup}" \\
+  --firewall-name "${name}" \\
+  --name "${name}-ipconfig" \\
+  --public-ip-address "${publicIpName}" \\
+  --vnet-name "${vnetName}" \\
+  --subscription "${subscription}"
+
+FWPRIVATE_IP=$(az network firewall show \\
+  --resource-group "${resourceGroup}" \\
+  --name "${name}" \\
+  --subscription "${subscription}" \\
+  --query "ipConfigurations[0].privateIPAddress" -o tsv)
+echo "##vso[task.setvariable variable=${exportVar}]$FWPRIVATE_IP"
+"""
+    AzCli(serviceConnection, "Create firewall ${name}", script)
+}
+
+UpdateFirewallPolicy = lambda serviceConnection: str, subscription: str, resourceGroup: str, name: str, policyPath: str, location: str -> steps.Step {
+    script = """
+POLICY_TMP=$(mktemp)
+sed 's|"location": "[^"]*"|"location": "${location}"|g' "${policyPath}" > "$POLICY_TMP"
+az rest \\
+  --method put \\
+  --uri "https://management.azure.com/subscriptions/${subscription}/resourceGroups/${resourceGroup}/providers/Microsoft.Network/azureFirewalls/${name}?api-version=2025-05-01" \\
+  --headers "Content-Type=application/json" \\
+  --body "@$POLICY_TMP"
+rm -f "$POLICY_TMP"
+"""
+    AzCli(serviceConnection, "Update firewall policy ${name}", script)
+}