github actions: summarize Sytest results in an easy-to-read format (#10094)

... using the script from matrix-org/sytest#1052

.github/workflows/tests.yml

@@ -232,9 +232,9 @@ jobs:
       - name: Run SyTest
         run: /bootstrap.sh synapse
         working-directory: /src
-      - name: Dump results.tap
+      - name: Summarise results.tap
         if: ${{ always() }}
-        run: cat /logs/results.tap
+        run: /sytest/scripts/tap_to_gha.pl /logs/results.tap
       - name: Upload SyTest logs
         uses: actions/upload-artifact@v2
         if: ${{ always() }}

changelog.d/10094.misc

@@ -0,0 +1 @@
+In Github Actions workflows, summarize the Sytest results in an easy-to-read format.