ci: integrate protobuf version matrix into main test jobs

Consolidate protobuf compatibility testing into the main test jobs using
matrix include. Older protobuf versions (4.x, 5.x) are only tested with
Python 3.9 and 3.14 (edge versions), while all Python versions test with
the default protobuf.

Matrix per job:
- 6 Python versions × default protobuf = 6 jobs
- 2 Python versions × 2 older protobuf = 4 jobs
- Total: 10 jobs per DGraph version (20 total)

Author: mlwelles

.github/workflows/ci-pydgraph-tests.yml

@@ -17,85 +17,24 @@ permissions:
   contents: read
 jobs:
   test-pydgraph-dgraph-latest:
-    name: Test (Python ${{ matrix.python-version }} / DGraph Latest)
-    runs-on: ubuntu-latest
-    strategy:
-      matrix:
-        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13", "3.14"]
-    steps:
-      - name: Checkout pydgraph
-        uses: actions/checkout@v5
-        with:
-          repository: dgraph-io/pydgraph
-          ref: ${{ github.ref }}
-      - name: Setup python runtime and tooling
-        uses: ./.github/actions/setup-python-and-tooling
-        with:
-          python-version: ${{ matrix.python-version }}
-      - name: Pin python version
-        run: uv python pin ${{ matrix.python-version }}
-      - name: Setup project dependencies
-        run: INSTALL_MISSING_TOOLS=true make setup
-      - name: Sync python virtualenv
-        run: make sync
-      - name: Run tests
-        run: make test
-  test-pydgraph-dgraph-head:
-    name: Test Pydgraph (Python ${{ matrix.python-version }} / DGraph HEAD)
-    runs-on: ubuntu-latest
-    strategy:
-      matrix:
-        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13", "3.14"]
-    steps:
-      - name: Checkout Dgraph main latest
-        uses: actions/checkout@v5
-        with:
-          path: dgraph
-          repository: dgraph-io/dgraph
-          ref: main
-      - name: Setup Go
-        uses: actions/setup-go@v6
-        with:
-          go-version-file: dgraph/go.mod
-      - name: Build dgraph binary
-        working-directory: ./dgraph
-        run: make docker-image # also builds dgraph binary
-      - name: Install dgraph binary
-        working-directory: ./dgraph
-        run: mv dgraph/dgraph ~/go/bin/dgraph
-      - name: Checkout pydgraph
-        uses: actions/checkout@v5
-        with:
-          path: pydgraph
-          repository: dgraph-io/pydgraph
-          ref: ${{ github.ref }}
-      - name: Setup python runtime and tooling
-        uses: ./pydgraph/.github/actions/setup-python-and-tooling
-        with:
-          python-version: ${{ matrix.python-version }}
-      - name: Pin python version
-        working-directory: ./pydgraph
-        run: uv python pin ${{ matrix.python-version }}
-      - name: Setup project dependencies
-        working-directory: ./pydgraph
-        run: INSTALL_MISSING_TOOLS=true make setup
-      - name: Sync python virtualenv
-        working-directory: ./pydgraph
-        run: make sync
-      - name: Run tests
-        working-directory: ./pydgraph
-        run: DGRAPH_IMAGE_TAG=local make test
-  test-pydgraph-protobuf-compat-dgraph-latest:
     name:
-      Test Pydgraph (Python ${{ matrix.python-version }} / ${{ matrix.protobuf-version }} / DGraph
-      Latest)
+      Test (Python ${{ matrix.python-version }}${{ matrix.protobuf-version && format(' / {0}',
+      matrix.protobuf-version) || '' }} / DGraph Latest)
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["3.9", "3.14"]
-        protobuf-version:
-          - protobuf>=4.23.0,<5.0.0
-          - protobuf>=5.0.0,<6.0.0
+        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13", "3.14"]
+        protobuf-version: [""]
+        include:
+          # Test older protobuf versions only on edge Python versions
+          - python-version: "3.9"
+            protobuf-version: protobuf>=4.23.0,<5.0.0
+          - python-version: "3.9"
+            protobuf-version: protobuf>=5.0.0,<6.0.0
+          - python-version: "3.14"
+            protobuf-version: protobuf>=4.23.0,<5.0.0
+          - python-version: "3.14"
+            protobuf-version: protobuf>=5.0.0,<6.0.0
     steps:
       - name: Checkout pydgraph
         uses: actions/checkout@v5
@@ -113,20 +52,29 @@ jobs:
       - name: Sync python virtualenv
         run: make sync
       - name: Install specific protobuf version
+        if: matrix.protobuf-version != ''
         run: uv pip install "${{ matrix.protobuf-version }}"
       - name: Run tests
         run: make test
-  test-pydgraph-protobuf-compat-dgraph-head:
+  test-pydgraph-dgraph-head:
     name:
-      Test Pydgraph (Python ${{ matrix.python-version }} / ${{ matrix.protobuf-version }} / DGraph
-      HEAD)
+      Test Pydgraph (Python ${{ matrix.python-version }}${{ matrix.protobuf-version && format(' /
+      {0}', matrix.protobuf-version) || '' }} / DGraph HEAD)
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["3.9", "3.14"]
-        protobuf-version:
-          - protobuf>=4.23.0,<5.0.0
-          - protobuf>=5.0.0,<6.0.0
+        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13", "3.14"]
+        protobuf-version: [""]
+        include:
+          # Test older protobuf versions only on edge Python versions
+          - python-version: "3.9"
+            protobuf-version: protobuf>=4.23.0,<5.0.0
+          - python-version: "3.9"
+            protobuf-version: protobuf>=5.0.0,<6.0.0
+          - python-version: "3.14"
+            protobuf-version: protobuf>=4.23.0,<5.0.0
+          - python-version: "3.14"
+            protobuf-version: protobuf>=5.0.0,<6.0.0
     steps:
       - name: Checkout Dgraph main latest
         uses: actions/checkout@v5
@@ -140,7 +88,7 @@ jobs:
           go-version-file: dgraph/go.mod
       - name: Build dgraph binary
         working-directory: ./dgraph
-        run: make docker-image
+        run: make docker-image # also builds dgraph binary
       - name: Install dgraph binary
         working-directory: ./dgraph
         run: mv dgraph/dgraph ~/go/bin/dgraph
@@ -164,6 +112,7 @@ jobs:
         working-directory: ./pydgraph
         run: make sync
       - name: Install specific protobuf version
+        if: matrix.protobuf-version != ''
         working-directory: ./pydgraph
         run: uv pip install "${{ matrix.protobuf-version }}"
       - name: Run tests