ci: port BSD jobs to new cross-platform-actions syntax

The run input is deprecated. Split the monolithic scripts into the same
step layout as the other jobs. Sync the sources once at VM start and
skip the per-step file synchronization, since everything runs inside the
VM anyway.

This will make reading logs easier.

.github/workflows/build.yml

@@ -485,13 +485,20 @@ jobs:
   openbsd:
     runs-on: ubuntu-latest # until https://github.com/actions/runner/issues/385
     timeout-minutes: 15 # avoid any weirdness with the VM
+    defaults:
+      run:
+        shell: cpa.sh {0} --sync-files none
     steps:
       - uses: actions/checkout@v7
-    - name: Test in OpenBSD VM
+
+      - name: Start OpenBSD VM
         uses: cross-platform-actions/action@v1.4.0
         with:
           operating_system: openbsd
           version: '7.8'
+          sync_files: runner-to-vm
+
+      - name: Install dependencies
         run: |
           sudo pkg_add -U \
               cmake \
@@ -523,22 +530,44 @@ jobs:
               vulkan-loader \
               vulkan-headers \
               zimg
+
+      - name: Build with meson
+        id: build
+        run: |
           ./ci/build-openbsd.sh
-            if ! meson test -C build; then
+
+      - name: Print meson log
+        if: ${{ failure() && steps.build.outcome == 'failure' }}
+        run: |
+          cat ./build/meson-logs/meson-log.txt
+
+      - name: Run meson tests
+        id: tests
+        run: |
+          meson test -C build
+
+      - name: Print meson test log
+        if: ${{ failure() && steps.tests.outcome == 'failure' }}
+        run: |
           cat ./build/meson-logs/testlog.txt
-                exit 1
-            fi
 
   freebsd:
     runs-on: ubuntu-latest # until https://github.com/actions/runner/issues/385
     timeout-minutes: 15 # avoid any weirdness with the VM
+    defaults:
+      run:
+        shell: cpa.sh {0} --sync-files none
     steps:
       - uses: actions/checkout@v7
-    - name: Test in FreeBSD VM
+
+      - name: Start FreeBSD VM
         uses: cross-platform-actions/action@v1.4.0
         with:
           operating_system: freebsd
           version: '15.1'
+          sync_files: runner-to-vm
+
+      - name: Install dependencies
         run: |
           sudo pkg update
           sudo pkg install -y \
@@ -578,11 +607,26 @@ jobs:
               v4l_compat \
               vulkan-headers \
               wayland-protocols
+
+      - name: Build with meson
+        id: build
+        run: |
           ./ci/build-freebsd.sh
-            if ! meson test -C build; then
+
+      - name: Print meson log
+        if: ${{ failure() && steps.build.outcome == 'failure' }}
+        run: |
+          cat ./build/meson-logs/meson-log.txt
+
+      - name: Run meson tests
+        id: tests
+        run: |
+          meson test -C build
+
+      - name: Print meson test log
+        if: ${{ failure() && steps.tests.outcome == 'failure' }}
+        run: |
           cat ./build/meson-logs/testlog.txt
-                exit 1
-            fi
 
   msys2:
     runs-on: ${{ matrix.os }}