ci: remove unimportant and complicated job filtering

.github/workflows/integration-test.yaml

@@ -24,40 +24,17 @@ on:
   workflow_dispatch:
 
 jobs:
-  # This job is used as a workaround to a limitation when using a matrix of
-  # variations that a job should be executed against. The limitation is that a
-  # matrix once defined can't include any conditions.
-  #
-  # What this job does before our real test job with a matrix of variations run,
-  # is to decide on that matrix of variations a conditional logic of our choice.
-  #
-  # For more details, see this excellent stack overflow answer:
-  # https://stackoverflow.com/a/65434401/2220152
-  #
-  decide-on-test-jobs-to-run:
-    name: Decide on test jobs to run
-    runs-on: ubuntu-latest
+  integration-tests:
+    # integration tests run in a container,
+    # not in the worker, so this version is not relevant to the tests
+    # and can be the same for all tested versions
+    runs-on: ubuntu-22.04
 
-    outputs:
-      matrix: ${{ steps.set-matrix.outputs.matrix }}
-
-    steps:
-      # Currently, this logic filters out a matrix entry equaling a specific git
-      # reference identified by "dont_run_on_ref".
-      - name: Decide on test jobs to run
-        id: set-matrix
-        run: |
-          matrix_post_filter=$(
-            echo "$matrix_include_pre_filter" \
-              | yq e --output-format=json '.' - \
-              | jq -c '{"include": map( . | select(.dont_run_on_ref != "${{ github.ref }}" ))}'
-          )
-          echo "matrix=$matrix_post_filter" >> $GITHUB_OUTPUT
-
-          echo "The subsequent job's matrix are:"
-          echo $matrix_post_filter | jq -C '.'
-        env:
-          matrix_include_pre_filter: |
+    name: ${{ matrix.name }}
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
           - name: "Debian 11, Py 3.9"
             distro_image: "debian:11"
             runs_on: "ubuntu-22.04"
@@ -78,19 +55,6 @@ jobs:
             distro_image: "ubuntu:22.04"
             extra_flags: --upgrade-from=0.2.0
 
-  integration-tests:
-    needs: decide-on-test-jobs-to-run
-
-    # integration tests run in a container,
-    # not in the worker, so this version is not relevant to the tests
-    # and can be the same for all tested versions
-    runs-on: ubuntu-22.04
-
-    name: ${{ matrix.name }}
-    strategy:
-      fail-fast: false
-      matrix: ${{ fromJson(needs.decide-on-test-jobs-to-run.outputs.matrix) }}
-
     steps:
       - uses: actions/checkout@v3
       - uses: actions/setup-python@v4