Initial GitHub Actions workflow for main branch

Starting with REUSE compliance check as first action

Author: penyuan

.github/workflows/main.yml

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+# This is a basic workflow to help you get started with Actions
+
+name: CI
+
+# Controls when the action will run. 
+on:
+    # Triggers the workflow on push or pull request events but only for the main branch
+    push:
+        branches: [ main ]
+    pull_request:
+        branches: [ main ]
+
+    # Allows you to run this workflow manually from the Actions tab
+    workflow_dispatch:
+
+# A workflow run is made up of one or more jobs that can run sequentially or in parallel
+jobs:
+    # This workflow contains a single job called "build"
+    build:
+        # The type of runner that the job will run on
+        runs-on: ubuntu-latest
+
+        # Steps represent a sequence of tasks that will be executed as part of the job
+        steps:
+            # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
+            - name: Check-out repository
+              uses: actions/checkout@v2
+              
+            # REUSE compliance check
+            - name: REUSE compliance check
+              uses: fsfe/[email protected]
+              with:
+                  args: lint
+
+            # Runs a single command using the runners shell
+            #- name: Run a one-line script
+            #  run: echo Hello, world!
+
+            # Runs a set of commands using the runners shell
+            #- name: Run a multi-line script
+            #  run: |
+            #      echo Add other actions to build,
+            #      echo test, and deploy your project.