ci/tests: break individual test steps out into jobs

.github/workflows/tests.yaml

@@ -81,12 +81,43 @@ jobs:
       - name: Check for changed files
         run: git diff --exit-code --stat HEAD tests/repositories/fixtures/pypi.org
 
+  mypy:
+    name: mypy (${{ matrix.os.name }} / Python ${{ matrix.python-version }})
+    runs-on: ${{ matrix.os.image }}
+    if: needs.changes.outputs.tests-mypy == 'true'
+    needs:
+      - changes
+      - lockfile
+    strategy:
+      matrix:
+        os:
+          - name: Ubuntu
+            image: ubuntu-22.04
+          - name: macOS
+            image: macos-12
+          - name: Windows
+            image: windows-2022
+        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
+      fail-fast: false
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: ./.github/actions/bootstrap-poetry
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      - run: poetry install --sync
+
+      - run: poetry run mypy
+
   pytest:
-    name: ${{ matrix.os.name }} / ${{ matrix.python-version }}
+    name: pytest (${{ matrix.os.name }} / Python ${{ matrix.python-version }})
     runs-on: ${{ matrix.os.image }}
+    if: needs.changes.outputs.tests-pytest == 'true'
     needs:
       - changes
       - lockfile
+      - mypy
     strategy:
       matrix:
         os:
@@ -100,48 +131,57 @@ jobs:
       fail-fast: false
     steps:
       - uses: actions/checkout@v4
-        if: needs.changes.outputs.tests-pytest == 'true'
 
       - uses: ./.github/actions/bootstrap-poetry
-        if: needs.changes.outputs.tests-pytest == 'true'
         with:
           python-version: ${{ matrix.python-version }}
 
       - run: poetry install --sync --with github-actions
-        if: needs.changes.outputs.tests-pytest == 'true'
-
-      - name: Run mypy
-        if: needs.changes.outputs.tests-pytest == 'true'
-        run: poetry run mypy
 
-      - name: Run pytest
-        if: needs.changes.outputs.tests-pytest == 'true'
+      - run: poetry run pytest --integration -v
         env:
           POETRY_TEST_INTEGRATION_GIT_USERNAME: ${{ github.actor }}
           POETRY_TEST_INTEGRATION_GIT_PASSWORD: ${{ github.token }}
-        run: poetry run pytest --integration -v
 
-      - name: Get Plugin Version (poetry-plugin-export)
-        id: poetry-plugin-export-version
-        if: needs.changes.outputs.tests-pytest == 'true'
-        run: |
-          echo version=$(poetry show poetry-plugin-export | grep version | cut -d : -f 2 | xargs) >> $GITHUB_OUTPUT
+      - run: git diff --exit-code --stat HEAD
 
-      - name: Checkout Plugin Source (poetry-plugin-export)
-        uses: actions/checkout@v4
-        if: needs.changes.outputs.tests-pytest == 'true'
+  pytest-export:
+    name: pytest (${{ matrix.os.name }} / Python ${{ matrix.python-version }})
+    runs-on: ${{ matrix.os.image }}
+    needs:
+      - changes
+      - lockfile
+      - mypy
+    strategy:
+      matrix:
+        os:
+          - name: Ubuntu
+            image: ubuntu-22.04
+          - name: macOS
+            image: macos-12
+          - name: Windows
+            image: windows-2022
+        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
+      fail-fast: false
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: ./.github/actions/bootstrap-poetry
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      - run: poetry install --sync --with github-actions
+
+      - id: poetry-plugin-export
+        run: echo version=$(pip list --format json | jq -r '.[] | select(.name == "poetry-plugin-export").version') >> $GITHUB_OUTPUT
+
+      - uses: actions/checkout@v4
         with:
           path: poetry-plugin-export
           repository: python-poetry/poetry-plugin-export
-          ref: refs/tags/${{ steps.poetry-plugin-export-version.outputs.version }}
+          ref: refs/tags/${{ steps.poetry-plugin-export.outputs.version }}
 
-      - name: Run pytest (poetry-plugin-export)
-        if: needs.changes.outputs.tests-pytest == 'true'
+      - run: poetry run -C .. pytest -v
         working-directory: ./poetry-plugin-export
-        run: poetry run -C .. pytest -v
 
-      - name: Check for clean working tree
-        if: needs.changes.outputs.tests-pytest == 'true'
-        run: |
-          git diff --exit-code --stat HEAD
-          git -C poetry-plugin-export diff --exit-code --stat HEAD
+      - run: git -C poetry-plugin-export diff --exit-code --stat HEAD