Fix Python 3.12 container tests and simplify CI matrix

- Add conditional symlink fix for Python 3.12 on Alpine Linux
  - Python 3.12 expects linux-gnu extension suffix, but Alpine provides linux-musl
  - Create symlinks from *-linux-gnu.so to *-linux-musl.so for C extensions
  - Fix is only applied when PYTHON_VERSION="3.12" to avoid affecting other versions

- Fix dockerfile stage reference: FROM beta AS pro → FROM pre AS pro
  - Completes the beta→pre rename that was missed on line 108

- Simplify GitHub Actions Python version matrix
  - Remove get-python-version job from both test.yml and docker-publish.yml
  - Hardcode Python versions as `['3.12', '3.13']` to avoid duplication
  - Previously, 3.13 was tested twice (hardcoded + from .python-version file)
  - Makes workflows cleaner and easier to understand

This fixes the `ModuleNotFoundError` for `pydantic_core._pydantic_core in`
Docker containers running Python 3.12, while maintaining compatibility
with other Python versions.

Signed-off-by: Phillip Sitbon <phillip.sitbon@gmail.com>

Author: sitbon

.github/workflows/docker-publish.yml

@@ -1,4 +1,4 @@
-name: Build and Publish Docker Images
+name: Build, Test, and Publish Docker Images
 
 on:
   push:
@@ -13,29 +13,15 @@ env:
   IMAGE_NAME: ${{ github.repository }}
 
 jobs:
-  get-python-version:
-    runs-on: ubuntu-latest
-    outputs:
-      version: ${{ steps.python-version.outputs.version }}
-    steps:
-      - name: Checkout code
-        uses: actions/checkout@v4
-      
-      - name: Read Python version
-        id: python-version
-        run: |
-          echo "version=$(cat .python-version)" >> $GITHUB_OUTPUT
-
-  test-dev:
-    needs: get-python-version
+  test-dev-container:
     runs-on: ubuntu-latest
     permissions:
       contents: read
       packages: write
 
     strategy:
       matrix:
-        python-version: ['3.12', '3.13', '${{ needs.get-python-version.outputs.version }}']
+        python-version: ['3.12', '3.13']
       fail-fast: false
 
     steps:
@@ -101,7 +87,7 @@ jobs:
           cache-from: type=gha
 
   build-and-push:
-    needs: test-dev
+    needs: test-dev-container
     runs-on: ubuntu-latest
     permissions:
       contents: read

.github/workflows/test.yml

@@ -1,4 +1,4 @@
-name: Test
+name: Tests
 
 on:
   push:
@@ -7,25 +7,11 @@ on:
     branches: ['*']
 
 jobs:
-  get-python-version:
-    runs-on: ubuntu-latest
-    outputs:
-      version: ${{ steps.python-version.outputs.version }}
-    steps:
-      - name: Checkout code
-        uses: actions/checkout@v4
-      
-      - name: Read Python version
-        id: python-version
-        run: |
-          echo "version=$(cat .python-version)" >> $GITHUB_OUTPUT
-
   test:
-    needs: get-python-version
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ['3.12', '3.13', '${{ needs.get-python-version.outputs.version }}']
+        python-version: ['3.12', '3.13']
       fail-fast: false  # Continue testing other versions if one fails
 
     steps:

dockerfile

@@ -53,6 +53,13 @@ RUN --mount=type=cache,uid=${UID},gid=${UID},target=${HOME}/.cache/uv \
     --mount=type=bind,source=pyproject.toml,target=pyproject.toml \
     uv sync --locked --no-install-project --no-dev
 
+# Fix for Python 3.12 extension suffix mismatch on Alpine
+# Python 3.12 expects linux-gnu but we have linux-musl wheels
+RUN if [ "${PYTHON_VERSION}" = "3.12" ]; then \
+        find .venv/lib -name "*.cpython-*-x86_64-linux-musl.so" -exec sh -c \
+            'ln -sf "$(basename "$1")" "$(dirname "$1")/$(echo "$(basename "$1")" | sed "s/-musl\.so$/-gnu.so/")"' _ {} \; ; \
+    fi
+
 # Then, add the rest of the project source code and install it
 # Installing separately from its dependencies allows optimal layer caching
 ADD --chown=${USER}:${USER} pyproject.toml uv.lock readme.md license.md ./
@@ -98,7 +105,7 @@ RUN chown -R root:${USER} ${HOME}/.venv ${HOME}/${PACKAGE} && \
 
 USER ${USER}
 
-FROM beta AS pro
+FROM pre AS pro
 
 LABEL org.opencontainers.image.source=https://github.com/sitbon/magg \
       org.opencontainers.image.description="MAGG - The Model Context Protocol (MCP) Aggregator" \