CI: Implement container action

.github/DockerfileBase

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+FROM ubuntu:latest AS base
+#LABEL stage=base
+# Install essential packages and UV
+RUN apt-get update && apt-get install -y --no-install-recommends make curl ca-certificates && \
+        update-ca-certificates && \
+        curl -LsSf https://astral.sh/uv/install.sh | sh
+
+# Copy requirements file after installing essential tools
+COPY ansible_collections/arista/avd/requirements-dev.txt /requirements-dev.txt
+
+# Install Python versions and dependencies in a single step
+RUN . $HOME/.local/bin/env && for VERSION in 3.10 3.11 3.12 3.13; do \
+      UV_PYTHON_INSTALL_DIR=/venvs/python-versions uv venv --python $VERSION /venvs/UV$VERSION && \
+      /venvs/UV$VERSION/bin/python -m ensurepip --upgrade && \
+      /venvs/UV$VERSION/bin/python -m pip install --upgrade pip setuptools && \
+      /venvs/UV$VERSION/bin/python -m pip install mock pytest pytest-mock pytest-xdist pyyaml "ansible-core<2.19.0" \
+      -r /requirements-dev.txt --upgrade; \
+    done
+
+FROM ubuntu:latest AS base_run
+COPY --from=base /venvs /venvs

.github/DockerfileBuild

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+ARG BASE_IMAGE_TAG
+FROM ${BASE_IMAGE_TAG} AS build
+LABEL stage=build
+COPY . /avd
+WORKDIR /avd/python-avd
+
+RUN apt-get update && apt-get install -y --no-install-recommends make && \
+    /venvs/UV3.11/bin/python -m pip install --break-system-packages build && \
+    /venvs/UV3.11/bin/python -m build --wheel --outdir /tmp/wheels && \
+    for VERSION in 3.10 3.11 3.12 3.13; do \
+      /venvs/UV$VERSION/bin/python -m pip install --no-cache-dir /tmp/wheels/*.whl; \
+    done
+
+FROM ubuntu:latest AS run
+LABEL stage=run
+# Copy virtual environments from the build stage
+COPY --from=build /venvs /venvs