Add minimal build/test workflow

Copied from vscode-trace-extension and adapted to run the
existing tests in this repo.

Signed-off-by: Marc Dumais <[email protected]>

Author: marcdumais-work

.github/workflows/build.yml

@@ -0,0 +1,76 @@
+name: build
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+
+  build:
+    runs-on: ${{ matrix.os }}
+
+    strategy:
+      matrix:
+        os: [ubuntu-latest]
+        node-version: [16.x]
+
+    steps:
+    - name: install dependencies on ubuntu
+      if: startsWith(matrix.os,'ubuntu')
+      run: |
+        sudo apt install -y make gcc pkg-config build-essential libx11-dev libxkbfile-dev
+
+    - uses: actions/checkout@v2
+
+    - name: Use Node.js ${{ matrix.node-version }}
+      uses: actions/setup-node@v1
+      with:
+        node-version: ${{ matrix.node-version }}
+
+    - name: Get yarn cache directory path
+      id: yarn-cache-dir-path
+      run: echo "::set-output name=dir::$(yarn cache dir)"
+
+    - name: Cache node_modules with yarn
+      uses: actions/cache@v2
+      id: yarn-cache # use this to check for `cache-hit` (`steps.yarn-cache.outputs.cache-hit != 'true'`)
+      with:
+        path: ${{ steps.yarn-cache-dir-path.outputs.dir }}
+        key: ${{ runner.os }}-yarn-${{ hashFiles('**/yarn.lock') }}
+        restore-keys: |
+          ${{ runner.os }}-yarn-
+
+    - run: yarn --frozen-lockfile
+
+  tests:
+    timeout-minutes: 60
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3
+    - uses: actions/setup-node@v3
+      with:
+        node-version: 16
+    - name: Install dependencies
+      run: yarn
+    - name: Run tests
+      uses: coactions/setup-xvfb@v1
+      with:
+        run: yarn test
+
+  code-lint:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Check out Git repository
+      uses: actions/checkout@v2
+
+    - uses: actions/setup-node@v1
+      with:
+        node-version: '16'
+
+    # ESLint and Prettier must be in `package.json`
+    - run: yarn --frozen-lockfile --ignore-scripts
+
+    - run: yarn lint

README.md

@@ -20,7 +20,7 @@ This README is the usual entry point for documenting this extension.
 Run `yarn`, which should automatically include `yarn install`.
 
 * This extension is bundled using `webpack`, originally based on [the guide][guide].
-* There is no support yet for any automated CI on GitHub; planned for though.
+* There is only a modest automated CI test suite being run on GitHub
 
 ## Test