fix(ci): the signing dlib skips the imds probe that hangs hosted runners

apps/desktop/electron-builder.config.cjs

@@ -37,8 +37,53 @@ function isMachO(file) {
   return MACHO_MAGICS.has(buf.readUInt32BE(0))
 }
 
+// Windows signing with Azure Trusted Signing. Composed here, not as
+// -c.win.sign.* CLI arguments, for two reasons: the publisherName holds
+// spaces and commas that do not survive cmd.exe argument hops, and
+// additionalMetadata.ExcludeCredentials is an ARRAY, which dot-notation
+// cannot express. This file loads inside the electron-builder process,
+// so the values pass from the environment verbatim.
+//
+// ExcludeCredentials keeps only AzureCliCredential — the one azure/login
+// (OIDC) prepares in CI. The dlib otherwise walks the full
+// DefaultAzureCredential chain, and on GitHub-hosted runners (Azure VMs)
+// the ManagedIdentityCredential probe reaches a live IMDS endpoint that
+// never grants a token — observed as signtool hanging on the arm64
+// runners.
+function windowsSigning() {
+  if (!process.env.AZURE_SIGN_ENDPOINT || !process.env.AZURE_CLIENT_ID) {
+    return {}
+  }
+  return {
+    sign: {
+      type: "azure",
+      endpoint: process.env.AZURE_SIGN_ENDPOINT,
+      codeSigningAccountName: process.env.AZURE_SIGN_ACCOUNT,
+      certificateProfileName: process.env.AZURE_SIGN_PROFILE,
+      publisherName: process.env.AZURE_SIGN_PUBLISHER,
+      additionalMetadata: {
+        ExcludeCredentials: [
+          "EnvironmentCredential",
+          "WorkloadIdentityCredential",
+          "ManagedIdentityCredential",
+          "SharedTokenCacheCredential",
+          "VisualStudioCredential",
+          "VisualStudioCodeCredential",
+          "AzurePowerShellCredential",
+          "AzureDeveloperCliCredential",
+          "InteractiveBrowserCredential",
+        ],
+      },
+    },
+  }
+}
+
 module.exports = {
   ...build,
+  win: {
+    ...build.win,
+    ...windowsSigning(),
+  },
   mac: {
     ...build.mac,
     sign: {

apps/desktop/scripts/run-electron-builder.mjs

@@ -1,6 +1,5 @@
-// Wraps the electron-builder CLI so config that cannot ride through cmd.exe
-// argument hops (Windows signing values with spaces) is composed here, in the
-// first spawn with no shell in between.
+// Wraps the electron-builder CLI so the arguments compose in one place, in
+// the first spawn with no shell in between.
 //
 // electron-builder downloads and extracts Electron itself (via electronVersion
 // + ELECTRON_MIRROR). Earlier revisions passed -c.electronDist to reuse the
@@ -50,28 +49,13 @@ if (!args.includes("--publish") && !args.some((a) => a.startsWith("-p"))) {
   args.push("--publish", "never")
 }
 
-// Windows signing config is composed HERE, from the AZURE_SIGN_* variables,
-// not passed down as -c arguments. The publisherName contains spaces and
-// commas, and no quoting survives the cmd.exe hops between the outer build
-// script, npm's lifecycle spawn, and this script. This spawn is the first
-// one with no shell in between, so values pass through verbatim.
-// (win.sign.type=azure is the 27.x schema; 26.x called it azureSignOptions.
-// 27 signs through signtool /dlib from the winCodeSign 1.3.0 toolset — no
-// PowerShell TrustedSigning module, which froze the arm64 CI runner.)
-if (
-  args.includes("--win") &&
-  process.env.AZURE_SIGN_ENDPOINT &&
-  process.env.AZURE_CLIENT_ID &&
-  !args.some((a) => a.includes("win.sign"))
-) {
+// Windows signing config lives in electron-builder.config.cjs, composed from
+// the AZURE_SIGN_* variables. It cannot ride through -c arguments: the
+// publisherName contains spaces and commas that die in cmd.exe hops, and
+// additionalMetadata.ExcludeCredentials is an array, which dot-notation
+// cannot express. This block only announces the decision in the log.
+if (args.includes("--win") && process.env.AZURE_SIGN_ENDPOINT && process.env.AZURE_CLIENT_ID) {
   console.log(`[run-electron-builder] Windows signing: Azure Trusted Signing at ${process.env.AZURE_SIGN_ENDPOINT}`)
-  args.push(
-    "-c.win.sign.type=azure",
-    `-c.win.sign.endpoint=${process.env.AZURE_SIGN_ENDPOINT}`,
-    `-c.win.sign.codeSigningAccountName=${process.env.AZURE_SIGN_ACCOUNT}`,
-    `-c.win.sign.certificateProfileName=${process.env.AZURE_SIGN_PROFILE}`,
-    `-c.win.sign.publisherName=${process.env.AZURE_SIGN_PUBLISHER}`
-  )
 }
 
 const result = spawnSync(process.execPath, [electronBuilderCli(), ...args], {