try FreeBSD CI build

.github/workflows/build_freebsd.yml

@@ -0,0 +1,51 @@
+# This workflow will build and test gbsplay in various configurations on Windows.
+
+name: FreeBSD Build
+
+on:
+  push:
+  pull_request:
+    types: [opened]
+  schedule:
+    - cron: '23 4 5 * *'
+
+jobs:
+  build-windows:
+    name: Build and test on FreeBSD
+
+    runs-on: ${{ matrix.os.host }}
+
+    strategy:
+      matrix:
+        os:
+          - name: freebsd
+            architecture: x86-64
+            version: '13.2'
+            host: macos-12
+#          - name: freebsd
+#            architecture: arm64
+#            version: '13.2'
+#            host: ubuntu-latest
+        flags: ['']
+#        flags: ['', '--enable-sharedlibgbs']
+
+    steps:
+    - uses: actions/checkout@v4
+    - name: Build and test
+      env:
+        CONFIGURE_FLAGS: --enable-verbosebuild
+      run: |
+        gmake
+    - name: Check activated plugouts
+      run: |
+        ./check_plugouts.sh devdsp wav
+    - name: Check WAV plugout
+      run: |
+        ./check_plugout_wav.sh
+    - name: Check build flags
+      run: |
+        ./check_buildflags.sh --disable-hardening --enable-verbosebuild
+    - name: Dump configure on error
+      if: ${{ failure() }}
+      run: |
+        bash -x -v configure && cat config.err