removed freebsd workflow. It is not supported anymore

.github/workflows/freebsd.yml

@@ -1,22 +0,0 @@
-name: FreeBSD
-
-on: [push, pull_request]
-
-jobs:
-  build:
-    runs-on: macos-latest
-    steps:
-      - uses: actions/checkout@v2
-      - name: FreeBSD build
-        id: test
-        uses: vmactions/freebsd-vm@v0.1.4
-        with:
-          usesh: true
-          prepare: pkg install -y curl wget libssh gcc vim dbus pkgconf
-          run: |
-            curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs > /tmp/rustup.sh && \
-            chmod +x /tmp/rustup.sh && \
-            /tmp/rustup.sh -y
-            . $HOME/.cargo/env
-            cargo build --no-default-features
-            cargo test --no-default-features --verbose --features github-actions