chore(ci): add end step to CI workflow (#11)

# Description

Currently blocking #10 

# PR Checklist\*

- [ ] I have tested the changes locally.
- [ ] I have formatted the changes with [Prettier](https://prettier.io/)
and/or `cargo fmt` on default settings.

.github/workflows/test.yml

@@ -2,8 +2,8 @@ name: Noir tests
 
 on:
   push:
-   branches:
-    - main
+    branches:
+      - main
   pull_request:
 
 env:
@@ -42,3 +42,26 @@ jobs:
 
       - name: Run formatter
         run: nargo fmt --check
+
+  # This is a job which depends on all test jobs and reports the overall status.
+  # This allows us to add/remove test jobs without having to update the required workflows.
+  tests-end:
+    name: Noir End
+    runs-on: ubuntu-latest
+    # We want this job to always run (even if the dependant jobs fail) as we want this job to fail rather than skipping.
+    if: ${{ always() }}
+    needs:
+      - test
+      - format
+
+    steps:
+      - name: Report overall success
+        run: |
+          if [[ $FAIL == true ]]; then
+              exit 1
+          else
+              exit 0
+          fi
+        env:
+          # We treat any cancelled, skipped or failing jobs as a failure for the workflow as a whole.
+          FAIL: ${{ contains(needs.*.result, 'failure') || contains(needs.*.result, 'cancelled') || contains(needs.*.result, 'skipped') }}