.github/workflows: add freebsd.yml

Closes #2720

.github/workflows/freebsd.yml

@@ -0,0 +1,63 @@
+name: FreeBSD
+
+on: [push, pull_request]
+
+jobs:
+  test:
+    strategy:
+      matrix:
+        # TODO: Get Go versions from https://go.dev/dl/?mode=json
+        go: ['1.19.13', '1.20.14', '1.21.13', '1.22.6']
+    name: Test with Go ${{ matrix.go }} on FreeBSD
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        shell: bash
+    steps:
+      - name: Git
+        run: |
+          # See actions/checkout#135
+          git config --global core.autocrlf false
+          git config --global core.eol lf
+
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Test
+        uses: vmactions/freebsd-vm@v1
+        with:
+          usesh: true
+          prepare: |
+            # Install Go
+            fetch https://go.dev/dl/go${{matrix.go}}.freebsd-amd64.tar.gz
+            rm -fr /usr/local/go && tar -C /usr/local -xf go${{matrix.go}}.freebsd-amd64.tar.gz
+            ln -s /usr/local/go/bin/go /usr/local/bin
+
+            # Install dependencies
+            pkg install -y clang
+            pkg install -y alsa-lib libxcursor libxi libxinerama libxrandr mesa-libs pkgconf
+
+            # Set up Xvfb
+            export DISPLAY=':99.0'
+            Xvfb :99 -screen 0 1024x768x24 > /dev/null 2>&1 &
+
+          run: |
+            # go vet
+            go vet ./...
+            go install ./internal/vettools
+            go vet -vettool=$(which vettools) -v ./...
+
+            # go build
+            go build -v ./...
+            # Compile without optimization to check potential stack overflow.
+            # The option '-gcflags=all=-N -l' is often used at Visual Studio Code.
+            # See also https://go.googlesource.com/vscode-go/+/HEAD/docs/debugging.md#launch and the issue #2120.
+            go build "-gcflags=all=-N -l" -v ./...
+            env GOOS=js GOARCH=wasm go build -v ./...
+            env GOOS=windows GOARCH=386 go build -v ./...
+            env GOOS=windows GOARCH=amd64 go build -v ./...
+            env GOOS=windows GOARCH=arm go build -v ./...
+            env GOOS=windows GOARCH=arm64 go build -v ./...
+
+            # go test
+            go test -shuffle=on -v -p=1 ./...