Introduce github actions for regression tests.

.github/workflows/makefile.yml

@@ -0,0 +1,37 @@
+name: Regression Tests
+on: [push]
+jobs:
+  linux:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@master
+    - name: Install dependencies
+      run: sudo apt-get install -y bmake
+    - name: Configure
+      run: |
+        cat /etc/os-release
+        ./configure
+    - name: Build and test
+      run: bmake regress
+  linux_libbsd:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@master
+    - name: Install dependencies
+      run: sudo apt-get install -y bmake pkg-config libbsd-dev
+    - name: Configure
+      run: |
+        cat /etc/os-release
+        CFLAGS=$(pkg-config --cflags libbsd-overlay) ./configure CPPFLAGS="-DENABLE_SECCOMP_FILTER=1" LDFLAGS=$(pkg-config --libs libbsd-overlay)
+    - name: Build and test
+      run: bmake regress
+  macos:
+    runs-on: macos-latest
+    steps:
+    - uses: actions/checkout@master
+    - name: Install dependencies
+      run: brew install bmake
+    - name: Configure
+      run: ./configure
+    - name: Build and test
+      run: bmake regress