add openbsd CI build

.github/workflows/build.yml

@@ -129,6 +129,7 @@ jobs:
         prepare: pkg install -y gcc python3
         run: |
           set +e
+          python3 -m pip install --user setuptools
           make install
           make test
           make test-memleaks

.github/workflows/openbsd.yml

@@ -1,27 +1,25 @@
+# https://github.com/vmactions/openbsd-vm
 on: [push, pull_request]
 name: build
+concurrency:
+  group: ${{ github.ref }}-${{ github.workflow }}-${{ github.event_name }}-${{ github.ref == format('refs/heads/{0}', github.event.repository.default_branch) && github.sha || '' }}
+  cancel-in-progress: true
 jobs:
   py3-openbsd:
     runs-on: macos-12
     steps:
-      - name: Cancel previous runs
-        uses: styfle/cancel-workflow-action@0.9.1
-        with:
-          access_token: ${{ github.token }}
-
       - uses: actions/checkout@v3
-
       - name: Run tests
         id: test-openbsd
         uses: vmactions/openbsd-vm@v0
         with:
-          usesh: false
+          usesh: true
           mem: 2048
           prepare: |
-            pkg_add curl
-            pkg_add maven
+            pkg_add gcc python3
           run: |
             set +e
+            python3 -m pip install --user setuptools
             make install
             make test
             make test-memleaks