[gha] disable FreeBSD build

Additional info: https://github.com/vmactions/freebsd-vm/issues/74

.github/workflows/build-freebsd.yml

@@ -1,32 +0,0 @@
-name: Build on FreeBSD
-
-on: [push, pull_request]
-
-jobs:
-  build:
-    runs-on: macos-12
-    name: with UPnP
-
-    steps:
-    - name: Checkout
-      uses: actions/checkout@v3
-
-    - name: Test in FreeBSD
-      id: test
-      uses: vmactions/freebsd-vm@v0.3.1
-      with:
-        usesh: true
-        mem: 2048
-        sync: rsync
-        copyback: true
-        prepare: pkg install -y devel/cmake devel/gmake devel/boost-libs security/openssl net/miniupnpc
-        run: |
-          cd build
-          cmake -DWITH_UPNP=ON -DCMAKE_BUILD_TYPE=Release .
-          gmake -j2
-
-    - name: Upload artifacts
-      uses: actions/upload-artifact@v3
-      with:
-        name: i2pd-freebsd
-        path: build/i2pd