Add a FreeBSD and OpenBSD compilation test on Github

Using the vmactions on Github, it is also possible to test
compilation on various BSD flavors on Github. The .cirrus.yml
file is now not required anymore, so we can remove it.

.cirrus.yml

@@ -1,28 +0,0 @@
-freebsd_task:
-  freebsd_instance:
-    image_family: freebsd-14-3
-    cpu: 4
-    memory: 4G
-  install_script:
-    - pkg update
-    - pkg install -y pkgconf cmake gmake capstone4 GraphicsMagick png
-          devel/sdl20 devel/libedit
-  script:
-    - ./configure --enable-debug || { cat config.log; exit 1; }
-    - gmake -j$(sysctl -n hw.ncpu)
-    - ctest -j$(sysctl -n hw.ncpu) test
-      || { cat Testing/Temporary/LastTest.log; exit 1; }
-
-xcode_task:
-  osx_instance:
-    image: ghcr.io/cirruslabs/macos-runner:sonoma
-  download_cache:
-    folder: dl_cache
-    populate_script:
-      - if [ ! -d dl_cache ]; then mkdir dl_cache ; fi
-  install_script:
-    - ci/macos-setup.sh
-  script:
-    - ci/macos-build.sh
-  hatari_artifacts:
-    path: "hatari-snapshot.zip"

.github/workflows/bsd.yml

@@ -0,0 +1,49 @@
+name: Build Hatari on BSDs
+
+on:
+  push:
+    branches:
+    - main
+    - test
+    tags:
+    - v*
+
+jobs:
+
+  freebsd:
+    runs-on: ubuntu-latest
+    name: Compile Hatari on FreeBSD
+    steps:
+    - uses: actions/checkout@v6
+    - name: Compile Hatari with FreeBSD
+      id: test
+      uses: vmactions/freebsd-vm@v1
+      with:
+        usesh: true
+        prepare: |
+          pkg update
+          pkg install -y cmake gmake pkgconf capstone4 GraphicsMagick png \
+              devel/sdl20 devel/libedit
+        run: |
+          uname -a
+          ./configure --enable-debug --enable-werror || { cat config.log; exit 1; }
+          gmake -j$(sysctl -n hw.ncpu)
+          ctest -j$(sysctl -n hw.ncpu) --output-on-failure
+
+  openbsd:
+    runs-on: ubuntu-latest
+    name: Compile Hatari on OpenBSD
+    steps:
+    - uses: actions/checkout@v6
+    - name: Compile Hatari with OpenBSD
+      id: test
+      uses: vmactions/openbsd-vm@v1
+      with:
+        usesh: true
+        prepare: |
+          pkg_add cmake gmake pkgconf devel/sdl2 png
+        run: |
+          uname -a
+          ./configure --enable-debug --enable-werror || { cat config.log; exit 1; }
+          gmake -j$(sysctl -n hw.ncpu)
+          ctest -j$(sysctl -n hw.ncpu) --output-on-failure