Add a build container

Once this lands and is published, the dev container will be updated to be based on this image.

Author: brettcannon

.github/workflows/ci.yml

@@ -8,8 +8,31 @@ on:
     branches: [main]
 
 jobs:
-  build_devcontainer:
-    name: Build and test (Devcontainer)
+  build_build_container:
+    name: Build and test (build container)
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, ubuntu-24.04-arm]
+    runs-on: ${{ matrix.os }}
+    env:
+      TAG: cpython-buildcontainer:1.0.0-${{ github.run_id }}
+    steps:
+      - name: Checkout Push to Registry action
+        uses: actions/checkout@v5
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+      - name: Build Dockerfile
+        uses: docker/build-push-action@v6
+        with:
+          context: ./devcontainer
+          load: true
+          tags: ${{ env.TAG }}
+      - name: Test Clang version
+        run: docker run --rm ${{ env.TAG }} clang --version
+
+  build_dev_container:
+    name: Build and test (Dev container)
     strategy:
       fail-fast: false
       matrix:

.github/workflows/release.yml

@@ -10,6 +10,7 @@ on:
         type: choice
         options:
         - autoconf
+        - buildcontainer
         - devcontainer
 
 run-name: "Release: ${{ inputs.package }}"

buildcontainer/Dockerfile

@@ -0,0 +1,17 @@
+FROM docker.io/library/fedora:41
+
+LABEL org.opencontainers.image.base.name="docker.io/library/fedora:41"
+LABEL org.opencontainers.image.source="https://github.com/python/cpython-devcontainers"
+LABEL org.opencontainers.image.title="CPython build container"
+LABEL org.opencontainers.image.description="CPython build container for Linux."
+LABEL org.opencontainers.image.authors="Brett Cannon"
+
+ENV CC=clang
+
+# Remove a video codec repository to speed up installs.
+RUN dnf config-manager setopt fedora-cisco-openh264.enabled=False
+
+RUN mkdir -p /opt/cpython-devcontainer/bin
+COPY --chmod=755 install-builddeps.sh /opt/cpython-devcontainer/bin/
+
+RUN /opt/cpython-devcontainer/bin/install-builddeps.sh

buildcontainer/README.md

@@ -0,0 +1,5 @@
+This container image contains everything necessary to build CPython on Linux.
+
+It is **not** meant for general development unless you are space-constrained.
+For development you should use the
+[dev container image](https://github.com/python/cpython-devcontainers/tree/main/devcontainer).

buildcontainer/install-builddeps.sh

@@ -0,0 +1,25 @@
+#! /bin/bash -ex
+
+# Install build tools and CPython dependencies on Fedora.
+
+
+# Define dependencies as an array, for easier formatting & comments.
+# see: https://www.gnu.org/software/bash/manual/html_node/Arrays.html
+# Contents inspired by experience and
+# https://github.com/devcontainers/features/tree/main/src/common-utils .
+DEPS=(
+    # Bare minimum
+    /usr/bin/{blurb,clang,git}
+
+    # Necessary for getting Python build dependencies
+    'dnf5-command(builddep)'
+
+    # TODO: remove when Fedora version includes Python 3.14
+    libzstd-devel
+)
+
+dnf -y --nodocs --setopt=install_weak_deps=False install ${DEPS[@]}
+dnf -y --nodocs --setopt=install_weak_deps=False builddep python3
+
+# Don't leave caches in the container
+dnf -y clean all

devcontainer/README.md

@@ -0,0 +1,8 @@
+A general dev container for developing CPython for Linux and WASI.
+
+See the
+[devguide's container docs](https://devguide.python.org/getting-started/setup-building/#using-a-container)
+on how to use this container image for development.
+
+If you need a smaller/minimal container image, see the
+[build container](https://github.com/python/cpython-devcontainers/tree/main/buildcontainer).