Upgrade to macOS 12

Author: acj

.github/workflows/build.yml

@@ -5,14 +5,16 @@ on:
 jobs:
   package-box:
     name: Package Vagrant Boxes
-    runs-on: macos-10.15
+    runs-on: macos-12
     if: "startsWith(github.ref, 'refs/tags/')"
     strategy:
       matrix:
         box:
           - fbsd_13_0
           - fbsd_12_2
     steps:
+      - name: Install Vagrant
+        run: brew install vagrant
       - name: Cache Vagrant boxes
         uses: actions/cache@v2
         with: