Merge pull request #31 from lemire/dlemire/github_actions

Adding ubuntu tests.

Author: lemire

.github/workflows/ubuntu22.yml

@@ -0,0 +1,15 @@
+name: Ubuntu 22.04 CI (GCC 11)
+
+on: [push, pull_request]
+
+jobs:
+  ubuntu-build:
+    if: >-
+      ! contains(toJSON(github.event.commits.*.message), '[skip ci]') &&
+      ! contains(toJSON(github.event.commits.*.message), '[skip github]')
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@v3
+     - name: Use make
+        run: |
+          make && ./unit