github: port CLA check job to Github Actions

.github/workflows/test.yaml

@@ -3,7 +3,6 @@ on:
   pull_request:
     branches: [ "master", "release/**" ]
 jobs:
-  # TODO: port CLA check
   unit-tests:
     runs-on: ubuntu-16.04
     env:
@@ -67,8 +66,25 @@ jobs:
       run: cd ${{ github.workspace }}/src/github.com/snapcore/snapd/cmd/ && make check
     - name: Test Go
       run: cd ${{ github.workspace }}/src/github.com/snapcore/snapd && ./run-checks --unit
+
+  cla-check:
+    if: github.event_name == 'pull_request'
+    runs-on: ubuntu-16.04
+    steps:
+      - name: Install dependencies
+        run: |
+          sudo apt-get update
+          sudo apt-get install python-launchpadlib
+      - name: Checkout code
+        uses: actions/checkout@v2
+        with:
+          # The cla_check script reads git commit history
+          fetch-depth: 0
+      - name: CLA check
+        run: ./tests/lib/cla_check.py
+
   spread-canary:
-    needs: unit-tests
+    needs: [unit-tests, cla-check]
     runs-on: ubuntu-latest
     strategy:
       fail-fast: false