Add Cirrus-CI

Author: gnzlbg

.cirrus.yml

@@ -0,0 +1,13 @@
+task:
+  name: x86_64-unknown-freebsd
+  freebsd_instance:
+    image: freebsd-12-0-release-amd64
+  setup_script:
+    - pkg install -y curl
+    - curl https://sh.rustup.rs -sSf --output rustup.sh
+    - sh rustup.sh --default-toolchain nightly -y
+    - . $HOME/.cargo/env
+    - rustup default nightly
+  test_script:
+    - . $HOME/.cargo/env
+    - cargo build --all