Added metrics for test runs

Refs CORE-120

When test runs execute, use the new @tryghost/metrics package to send metrics to configurable backends.

At the moment, we're just sending the test run duration to our metric store in preparation of changes to the test suite.

.github/workflows/test.yml

@@ -105,6 +105,9 @@ jobs:
           mysql root password: 'root'
 
       - run: yarn
+
+      - run: date +%s > ${{ runner.temp }}/startTime # Get start time for test suite
+
       - run: yarn test:e2e
         env:
           database__connection__filename: /dev/shm/ghost-test.db
@@ -116,6 +119,38 @@ jobs:
         env:
           database__connection__filename: /dev/shm/ghost-test.db
 
+      # Get runtime in seconds for test suite
+      - run: |
+          startTime="$(cat ${{ runner.temp }}/startTime)"
+          endTime="$(date +%s)"
+          echo "test_time=$(($endTime-$startTime))" >> $GITHUB_ENV
+
+      - name: Tailscale Action
+        uses: tailscale/github-action@v1
+        with:
+          authkey: ${{ secrets.TAILSCALE_AUTHKEY }}
+
+      # Report time taken to metrics service
+      - uses: sam-lord/action-trigger-metric@main
+        with:
+          metricName: 'test-time'
+          metricValue: ${{ env.test_time }}
+          configuration: |
+            {
+              "metrics": {
+                "transports": ["elasticsearch"],
+                "metadata": {
+                  "database": "${{ matrix.env.DB }}",
+                  "node": "${{ matrix.node }}"
+                }
+              },
+              "elasticsearch": {
+                "host": "${{ secrets.ELASTICSEARCH_HOST }}",
+                "username": "${{ secrets.ELASTICSEARCH_USERNAME }}",
+                "password": "${{ secrets.ELASTICSEARCH_PASSWORD }}"
+              }
+            }
+
       - name: Unit test coverage
         run: yarn cov:unit
       - uses: codecov/codecov-action@v2