ci: add fail-fast false and fix runner toolcache permissions

Prevents one platform failure from cancelling all other builds.

Author: GeiserX

.github/workflows/desktop-release.yml

@@ -11,6 +11,7 @@ permissions:
 jobs:
   build-sidecar:
     strategy:
+      fail-fast: false
       matrix:
         include:
           - runner: [self-hosted, macOS, ARM64]
@@ -58,6 +59,7 @@ jobs:
   build-tauri:
     needs: build-sidecar
     strategy:
+      fail-fast: false
       matrix:
         include:
           - runner: [self-hosted, macOS, ARM64]