Improvements to CI pipeline (OSC#745)

Make CI jobs parallel with some other tweaks and updates.

.github/workflows/tests.yml

@@ -2,43 +2,56 @@ name: Tests
 
 on:
   push:
-    branches:
-      - master
+    branches: [master]
   pull_request:
 
 jobs:
   unit-tests:
+    strategy:
+      fail-fast: false
+      matrix:
+        os: ["ubuntu-latest"]
+        ruby: ["2.5.5"]
+        bundler: ["1.17.3"]
+    runs-on: ${{ matrix.os }}
     name: Unit tests
-    runs-on: ubuntu-latest
 
     steps:
-      - name: Checkout
+      - name: Checkout ${{ github.sha	}}
         uses: actions/checkout@v2
-      - name: Setup Ruby
-        uses: actions/setup-ruby@v1
+
+      - name: Setup Ruby ${{ matrix.ruby }} using Bundler ${{ matrix.bundler }}
+        uses: ruby/setup-ruby@v1
         with:
-          ruby-version: '2.5'
+          ruby-version: ${{ matrix.ruby }}
+          bundler: ${{ matrix.bundler }}
+
       - name: Cache dependencies
         uses: actions/cache@v2
         with:
           path: ~/vendor/bundle
           key: ${{ runner.os }}-gems-${{ hashFiles('apps/*/Gemfile.lock') }}
+
       - name: Setup Bundler
         run: |
-          gem install bundler -v 1.17.3
           bundle config path ~/vendor/bundle
+
       - name: Run ShellCheck
         run: rake test:shellcheck
+
       - name: Run unit tests
         run: rake test:unit
-  
+
   e2e-tests:
+    strategy:
+      matrix:
+        os: ["ubuntu-latest"]
+    runs-on: ${{ matrix.os }}
     name: End-to-end tests
-    runs-on: ubuntu-latest
-    needs: unit-tests
 
     steps:
-      - name: Checkout
+      - name: Checkout ${{ github.sha	}}
         uses: actions/checkout@v2
+
       - name: Run E2E tests
         run: rake test:e2e