chore(linter): fix hadolint warnings

Author: pstoeckle

templates/alpine.Dockerfile

@@ -6,7 +6,7 @@ FROM python:{{ python_image }} AS builder
 # Install node prereqs, nodejs and yarn
 # Ref: https://raw.githubusercontent.com/nodejs/docker-node/master/Dockerfile-alpine.template
 # Ref: https://yarnpkg.com/en/docs/install
-RUN apk add curl
+RUN apk add --no-cache curl && rm /var/cache/apk/*
 # FIXME: no arm + musl build yet
 # Ref: https://github.com/nodejs/unofficial-builds/pull/59
 # Ref: https://github.com/nodejs/node/pull/45756
@@ -19,10 +19,10 @@ FROM python:{{ python_image }}
 LABEL org.opencontainers.image.authors="Nikolai R Kristiansen <nikolaik@gmail.com>"
 
 RUN addgroup -g 1000 pn && adduser -u 1000 -G pn -s /bin/sh -D pn
-RUN apk add libstdc++
+RUN apk add --no-cache libstdc++ && rm /var/cache/apk/*
 COPY --from=builder /node-v{{ nodejs_canonical }}-linux-x64-musl /usr/local
 RUN corepack enable yarn
-RUN pip install -U pip pipenv uv
+RUN pip install --no-cache-dir -U pip pipenv uv
 
 # Poetry
 # Mimic what https://install.python-poetry.org does without the flexibility (platforms, install sources, etc).

templates/debian.Dockerfile

@@ -8,7 +8,7 @@ RUN groupadd --gid 1000 pn && useradd --uid 1000 --gid pn --shell /bin/bash --cr
 ENV POETRY_HOME=/usr/local
 
 RUN \
-{% if distro_variant == "slim" %}  apt-get update && apt-get install curl gnupg2 xz-utils -yqq && \
+{% if distro_variant == "slim" %}  apt-get update && apt-get install --no-install-recommends curl gnupg2 xz-utils -yqq && \
 {% endif %}  apt-get upgrade -yqq && \
   rm -rf /var/lib/apt/lists/*
 RUN NODE_VERSION="v{{ nodejs_canonical }}" \
@@ -31,5 +31,5 @@ RUN NODE_VERSION="v{{ nodejs_canonical }}" \
   && ln -s /usr/local/bin/node /usr/local/bin/nodejs
 RUN corepack enable yarn
 
-RUN pip install -U pip pipenv uv && \
+RUN pip install --no-cache-dir -U pip pipenv uv && \
   curl -fsSL --compressed https://install.python-poetry.org | python -