Only enable FreeBSD private runner on demand

Author: hasufell

.github/workflows/reusable-release.yml

@@ -413,6 +413,7 @@ jobs:
             ./out/*
 
   build-freebsd-x86_64:
+    if: ${{ vars.ENABLE_PRIVATE_RUNNERS == 1 }}
     name: Build FreeBSD x86_64
     runs-on: [self-hosted, FreeBSD, X64]
     env:
@@ -784,6 +785,7 @@ jobs:
         shell: pwsh
 
   test-freebsd-x86_64:
+    if: ${{ vars.ENABLE_PRIVATE_RUNNERS == 1 }}
     name: Test FreeBSD x86_64
     runs-on: [self-hosted, FreeBSD, X64]
     needs: ["build-freebsd-x86_64"]