Unify release workflow and keep mac arm64-only assets

Author: lightsofapollo

.github/RELEASE_SETUP.md

@@ -76,7 +76,6 @@ scripts/macos-notarize-dmg.sh target/aarch64-apple-darwin/release/bundle/osx/att
    ```
 3. `Release` workflow runs automatically and uploads:
    - `attn-v<VERSION>-darwin-arm64`
-   - `attn-v<VERSION>-darwin-x64`
    - matching `.sha256` files
    - `attn-v<VERSION>-darwin-arm64.dmg` and checksum when notarization secrets are configured
 4. A GitHub Release for the tag is created/updated with those assets.

.github/workflows/release.yml

@@ -20,9 +20,6 @@ jobs:
           - runner: macos-14
             target: aarch64-apple-darwin
             asset_suffix: darwin-arm64
-          - runner: macos-13
-            target: x86_64-apple-darwin
-            asset_suffix: darwin-x64
     steps:
       - name: Checkout
         uses: actions/checkout@v4

scripts/postinstall.mjs

@@ -20,7 +20,7 @@ const assetSuffix = resolveAssetSuffix(process.platform, process.arch);
 if (!assetSuffix) {
   console.warn(
     `attn: unsupported platform ${process.platform}/${process.arch}. ` +
-      "Currently supported: darwin-arm64, darwin-x64."
+      "Currently supported: darwin-arm64."
   );
   process.exit(0);
 }
@@ -47,9 +47,6 @@ function resolveAssetSuffix(platform, arch) {
   if (platform === "darwin" && arch === "arm64") {
     return "darwin-arm64";
   }
-  if (platform === "darwin" && arch === "x64") {
-    return "darwin-x64";
-  }
   return null;
 }