gh-actions: Specify FreeBSD as 15.0

Signed-off-by: Daniel Schaefer <[email protected]>

Author: JohnAZoidberg

.github/workflows/ci.yml

@@ -13,6 +13,8 @@ jobs:
       id: test
       uses: vmactions/freebsd-vm@v1
       with:
+        release: "15.0"
+        arch: x86_64
         usesh: true
         mem: 8192
         sync: rsync