ci: Cache docker image

Author: Daniel Sanz

.github/workflows/publish.yml

@@ -53,13 +53,15 @@ jobs:
           images: elementsinteractive/twyn
 
       - name: Build and push Docker image
-        uses: docker/build-push-action@v4
+        uses: docker/build-push-action@v5
         with:
           context: .
           file: ./Dockerfile
           push: true
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=registry,ref=elementsinteractive/twyn:buildcache
+          cache-to: type=registry,ref=elementsinteractive/twyn:buildcache,mode=max
   release_notes:
     runs-on: ubuntu-latest
     needs: push_to_docker_hub

Dockerfile

@@ -1,36 +1,49 @@
+ARG PYTHON_IMAGE=3.13-slim
+
 # --------------- `base` stage --------------- 
-FROM python:3.13-slim AS base
+FROM python:${PYTHON_IMAGE} AS base
 
-# Define variables
+# Define global values. Define them as ARG so they are not present in the final image, and so they can be modified
 ARG USER=twyn
 ARG GROUP=twyn
 ARG WORKDIR=/app
 ARG VENV_PATH=${WORKDIR}/.venv
 
-# Set `WORKDIR`
 WORKDIR ${WORKDIR}
 
 # Create a non-root user and group
 RUN groupadd -g 1001 ${GROUP} && \
-    useradd -m -u 1001 -g ${GROUP} -s /bin/bash ${USER}
-
-# Copy all the needed files, setting their user and group ownerships to the ones we just created
-COPY --chown=${USER}:${GROUP} src src
-COPY --chown=${USER}:${GROUP} pyproject.toml pyproject.toml
-COPY --chown=${USER}:${GROUP} README.md README.md
-COPY --chown=${USER}:${GROUP} poetry.lock poetry.lock
+    useradd -m -u 1001 -g ${GROUP} -s /bin/false ${USER}
 
 # --------------- `build` stage --------------- 
 FROM base AS build
 
+# Define stage variables
+ARG POETRY_VERSION=2.1.2
+ARG POETRY_PLUGIN_EXPORT_VERSION=1.9.0
+
+# These should never change, define as ENV
+ENV POETRY_HOME="/opt/poetry"
+ENV PATH="${POETRY_HOME}/bin:${PATH}"
+
+# Create venv and upgrade pip
+RUN python -m venv ${VENV_PATH} && \
+    ${VENV_PATH}/bin/pip install --no-cache-dir --upgrade pip 
+
 # Install poetry and set up the virtualenv configs
-RUN pip install --upgrade pip && \
-    pip install poetry && \
-    poetry config virtualenvs.in-project true && \ 
-    poetry config virtualenvs.path ${VENV_PATH}
+RUN apt-get update && apt-get install -y curl \
+    && curl -sSL https://install.python-poetry.org | POETRY_VERSION=$POETRY_VERSION python3
+
+RUN poetry self add poetry-plugin-export==${POETRY_PLUGIN_EXPORT_VERSION}
+
+# Copy all the needed files, without write permissions
+COPY poetry.lock pyproject.toml ./
 
-# Install `twyn` in the virtual environment
-RUN poetry install --only main
+# Export dependencies to requirements.txt (no dev deps)
+RUN poetry export --without-hashes --only main -f requirements.txt > requirements.txt
+
+# Create and install dependencies in the virtual env
+RUN ${VENV_PATH}/bin/pip install --no-cache-dir -r requirements.txt
 
 # --------------- `final` stage --------------- 
 FROM base AS final
@@ -39,8 +52,17 @@ FROM base AS final
 USER ${USER}:${GROUP}
 
 # Copy over the virtual environment with all its dependencies and the project installed
-COPY --from=build --chown=${USER}:${GROUP} ${VENV_PATH} ${VENV_PATH}
+COPY --from=build ${WORKDIR}/requirements.txt requirements.txt
 ENV PATH="${VENV_PATH}/bin:$PATH"
 
-# Set `ENTRYPOINT`
+# Copy venv with all its dependencies along with pyproject.toml
+COPY --from=build --chown=${USER}:${GROUP} ${VENV_PATH} ${VENV_PATH}
+COPY --from=build --chown=${USER}:${GROUP} ${WORKDIR}/pyproject.toml .
+
+# Copy source code
+COPY src src
+
+# Install the CLI tool
+RUN $VENV_PATH/bin/pip install --no-cache-dir .
+
 ENTRYPOINT [ "twyn" ]