Apply cache to dockerfile for the faster build

Author: MU-Software

infra/Dockerfile

@@ -15,32 +15,35 @@ RUN pnpm run build
 FROM python:3.12-slim-bookworm AS runtime
 SHELL [ "/bin/bash", "-euxvc"]
 
-RUN apt-get update; \
-    apt-get install  -y --no-install-recommends curl openssh-client gcc git libpq-dev; \
-    curl -sSL https://install.python-poetry.org | python3.12 -;
-
-ENV PATH="${PATH}:/root/.local/bin:"
-
-COPY ../backend/poetry.lock ../backend/pyproject.toml ./
-
-RUN poetry config experimental.system-git-client true; \
-    poetry config virtualenvs.create false; \
-    poetry install --only main --no-interaction --no-ansi --no-root;
-
 ARG GIT_HASH
 ENV TZ=Asia/Seoul \
     LANG=C.UTF-8 \
     LC_ALL=C.UTF-8 \
     PYTHONIOENCODING=UTF-8 \
-    DEPLOYMENT_GIT_HASH=$GIT_HASH
+    PYTHONUNBUFFERED=1 \
+    PYTHONDONTWRITEBYTECODE=1 \
+    POETRY_NO_INTERACTION=1 \
+    DEPLOYMENT_GIT_HASH=$GIT_HASH \
+    PATH="${PATH}:/root/.local/bin:"
 
 RUN ln -snf /usr/share/zoneinfo/$TZ /etc/localtime && echo $TZ > /etc/timezone \
     && apt-get update \
-    && apt-get install -y --no-install-recommends curl wget ca-certificates gnupg lsb-release supervisor usbutils udev \
+    && apt-get install -y --no-install-recommends curl gcc wget ca-certificates gnupg lsb-release supervisor usbutils udev \
     && apt-get autoremove -y \
     && apt-get autoclean -y \
     && apt-get clean -y \
-    && rm -rf /var/cache/apt/archives /var/lib/apt/lists/*;
+    && rm -rf /var/cache/apt/archives /var/lib/apt/lists/* \
+    && curl -sSL https://install.python-poetry.org | python3.12 -;
+
+COPY ../backend/poetry.lock ../backend/pyproject.toml ./
+
+# Install Python dependencies
+RUN --mount=type=cache,target=/home/.cache/pypoetry poetry install --only main --no-interaction --no-ansi --no-root;
+
+# Install playwright
+# Actually, caching browser binaries is not recommended as described in https://playwright.dev/python/docs/ci#caching-browsers,
+# but as we had to build image frequently for the fast development, we had to cache this to reduce build time.
+RUN --mount=type=cache,target=/home/.cache/ms-playwright poetry run playwright install --with-deps --only-shell chromium
 
 # Make docker to always copy app directory so that source code can be refreshed.
 ARG IMAGE_BUILD_DATETIME=unknown
@@ -56,10 +59,6 @@ COPY ../infra/supervisord.ini /etc/supervisord.conf
 RUN mkdir -p /var/log/supervisor
 RUN mkdir -p /var/log/poca
 
-# Install playwright
-RUN playwright install-deps chromium
-RUN playwright install chromium
-
 # Copy frontend build
 COPY --from=frontend-builder /app/dist /src/static