Added more debugging to find cause of skipped canary tests

refs https://github.com/TryGhost/DevOps/issues/57

- adds a step to output the `needs` context
- adds `cancelled` as a "failed" step because it means we haven't run
  all the tests
- unfortunately there's no way to assert all elements are one type
  (success), so we have to check for existence of the negative ones

.github/workflows/ci.yml

@@ -765,10 +765,13 @@ jobs:
     if: always()
     runs-on: ubuntu-latest
     steps:
-      - name: Check for failures
+      - name: Output needs
-        if: contains(needs.*.result, 'failure')
+        run: echo "${{ toJson(needs) }}"
+
+      - name: Check if any required jobs failed or been cancelled
+        if: contains(needs.*.result, 'failure') || contains(needs.*.result, 'cancelled')
         run: |
-          echo "One of the dependent jobs have failed. You may need to re-run it." && exit 1
+          echo "One of the dependent jobs have failed or been cancelled. You may need to re-run it." && exit 1
 
   canary:
     needs: [
@@ -777,7 +780,7 @@ jobs:
     ]
     name: Canary
     runs-on: ubuntu-latest
-    if: always() && needs.job_get_metadata.outputs.is_canary_branch == 'true' && !(contains(needs.*.result, 'failure') || contains(needs.*.result, 'skipped'))
+    if: always() && needs.job_get_metadata.outputs.is_canary_branch == 'true' && !(contains(needs.*.result, 'cancelled') || contains(needs.*.result, 'failure') || contains(needs.*.result, 'skipped'))
     steps:
       - name: Set env variables
         run: |