Only run bats diagnostics on failure (#24)

* Only run bats diagnostics on failure

* Try a different failure syntax

* Third time lucky?

* Always run if we failed, even though the previous step failed

As per actions/runner#491

* Try and fix the logic again

* Simplify the testing

* Try a different way of checking for failure

* Try matching on any status, is matrix confusing things?

* Drop the matrix for now

* Fix the workflow syntax

* Different variable name

* Undo the hacking, matrix the bats tests

* Actually run bats if we need to

* Undo the deliberate test breakage

.github/workflows/testing.yml

@@ -63,16 +63,22 @@ jobs:
 
   diagnose_bats:
     name: Diagnose bats
+    needs: test
+    if: always() && needs.test.result == 'failure'
     runs-on: ubuntu-latest
     continue-on-error: true
+    strategy:
+      fail-fast: false
+      matrix:
+        codespell_pip_version: ['codespell']
+        include:
+          - codespell_pip_version: 'git+https://github.com/codespell-project/codespell.git'
     steps:
       - uses: actions/checkout@v1
       - name: Set up Python
         uses: actions/setup-python@v2
-      - run: pip3 --quiet --quiet install git+https://github.com/codespell-project/codespell.git
+      - run: pip3 --quiet --quiet install ${{ matrix.codespell_pip_version }}
       - run: |
-          # Skip the bats diagnostics
-          exit 0
           # Simulate the Dockerfile COPY command
           [ -d "${RUNNER_TEMP}/code/" ] || sudo mkdir -p ${RUNNER_TEMP}/code/
           [ -f "${RUNNER_TEMP}/code/codespell-matcher.json" ] || sudo cp codespell-problem-matcher/codespell-matcher.json ${RUNNER_TEMP}/code/