FreeBSD CI: git safe.directory, 4 vCPUs, pinned vmactions/freebsd-vm

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

.github/workflows/freebsd.yml

@@ -28,10 +28,11 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - name: Build and test in a FreeBSD VM
-        uses: vmactions/freebsd-vm@v1
+        uses: vmactions/freebsd-vm@c46abacb49f09938ca4e1702d15d836285d694cc # v1
         with:
           release: "14.3"
           usesh: true
+          cpu: 4
           mem: 12288
           # Nothing to bring back; copying the target dir out of the VM fails on large builds.
           copyback: false
@@ -40,6 +41,8 @@ jobs:
             curl -fsSL https://sh.rustup.rs | sh -s -- -y --profile minimal
           run: |
             . "$HOME/.cargo/env"
+            # The checkout is synced in under another owner; let tests that call git read it.
+            git config --global --add safe.directory "*"
             rustc --version
             CARGO_PROFILE_DEV_DEBUG=0 cargo build --workspace --all-targets --locked
             CARGO_PROFILE_DEV_DEBUG=0 cargo test --workspace --locked