ci: Add a github build action

.github/workflows/build.yml

@@ -0,0 +1,19 @@
+name: Build
+
+on:
+  push:
+    branches:
+      - master
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Install dependencies
+      run: sudo ci/install.sh
+
+    - name: Build
+      run: ci/build.sh

.github/workflows/build.yml~

@@ -0,0 +1,25 @@
+name: Build and test
+
+# on: [workflow_dispatch]
+
+on:
+  push:
+    branches:
+      - master
+      - V5-9-patches
+
+jobs:
+  build_and_test:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: install required packages
+      run: sudo ci/install.sh
+
+    - name: build
+      run: ci/build.sh
+
+    - name: test
+      run: ci/test.sh