github/workflows: print error logs on freebsd

Despite being run in a VM, the workflow actually copies the files back
to the host. We can then explictly print the error logs on failure in
their own separate section for visibility instead of it being hidden
within all the vm output.

.github/workflows/build.yml

@@ -196,3 +196,13 @@ jobs:
                 #
         run: |
           ./ci/build-freebsd.sh
+
+    - name: Print meson log
+      if: ${{ failure() }}
+      run: |
+        cat ./build/meson-logs/meson-log.txt
+
+    - name: Print waf log
+      if: ${{ failure() }}
+      run: |
+        cat ./build/config.log