Remove molecule container building from core

.github/workflows/tox.yml

@@ -39,15 +39,6 @@ jobs:
           - tox_env: packaging
           - tox_env: eco
           - tox_env: dockerfile
-          - tox_env: build-containers
-            needs:
-              - dockerfile
-              - docs
-              - lint
-              - packaging
-              - py36
-              - py37
-              - py38
 
     steps:
       - uses: actions/checkout@v1

docs/contributing.rst

@@ -142,15 +142,6 @@ Generate the documentation, using `sphinx`_.
 
 .. _`sphinx`: http://www.sphinx-doc.org
 
-Build container images
-----------------------
-
-Build the container images with docker or podman.
-
-.. code-block:: bash
-
-    $ tox -e build-containers
-
 Documentation
 =============
 

docs/examples.rst

@@ -4,27 +4,15 @@ Common Molecule Use Cases
 
 .. _docker-usage-example:
 
-Docker
-======
+Running inside a container
+==========================
 
-Molecule can be executed via an Alpine Linux container by bind-mounting the
-Docker socket.  Currently, we only build images for the latest version
-of Ansible and Molecule.  In the future we may break this out into Molecule/
-Ansible versioned pairs.  The images are located on `quay.io`_.
+The building of Molecule container is taken care of by molecule-dist_ project.
 
-To test a role, change directory into the role to test, and execute Molecule as
-follows.
+Any questions or bugs related to use of molecule, from within a container,
+should be addressed by that standalone project.
 
-.. code-block:: bash
-
-    docker run --rm -it \
-        -v "$(pwd)":/tmp/$(basename "${PWD}"):ro \
-        -v /var/run/docker.sock:/var/run/docker.sock \
-        -w /tmp/$(basename "${PWD}") \
-        quay.io/ansible/molecule:3.0.8 \
-        molecule test
-
-.. _`quay.io`: https://quay.io/repository/ansible/molecule
+.. _`molecule-dist`: https://github.com/ansible-community/molecule-dist
 
 Docker With Non-Privileged User
 ===============================

tox.ini

@@ -125,25 +125,6 @@ extras =
     docker
     selinux
 
-[testenv:build-containers]
-description = Builds and eventually publishes molecule container will all plugins
-# skip under Windows
-platform = ^darwin|^linux
-# `usedevelop = True` overrided `skip_install` instruction, it's unwanted
-usedevelop = False
-# don't install Molecule in this env
-skip_install = True
-# don't install any Python dist deps
-deps =
-    setuptools_scm==3.3.3
-    packaging  # pyup: ignore
-# reset pre-commands
-commands_pre =
-commands =
-    python ./tools/build-containers.py
-allowlist_externals =
-    sh
-
 [testenv:packaging]
 description =
     Do packaging/distribution. If tag is not present or PEP440 compliant upload to