Simplified Dockerfile with a little reduced size (robusta-dev#559)

* Simplified Dockerfile with a little reduced size

* Removed ruamel.yaml.clib and GCC

Dockerfile

@@ -3,38 +3,23 @@ FROM python:3.9-slim
 RUN apt-get update \
     && dpkg --add-architecture arm64 \
     && apt-get install -y --no-install-recommends git ssh socat wget curl libcairo2 python3-dev libffi-dev socat \
-    && apt-get purge -y --auto-remove \
+    && pip3 install --no-cache-dir --upgrade pip \
     && rm -rf /var/lib/apt/lists/*
 
-# install a custom version of socat with readline enabled
-# disabled because of an issue with the libreadline7 dependency
-#RUN wget https://launchpad.net/~ionel-mc/+archive/ubuntu/socat/+build/15532886/+files/socat_1.7.3.2-2ubuntu2ionelmc2~ppa1_amd64.deb
-#RUN dpkg -i socat_1.7.3.2-2ubuntu2ionelmc2~ppa1_amd64.deb
-ENV ENV_TYPE=DEV
+ENV ENV_TYPE=DEV 
 
-# we install the project requirements and install the app in separate stages to optimize docker layer caching
-RUN mkdir /app
-RUN pip3 install --no-cache-dir --upgrade pip
+RUN mkdir /app 
 RUN curl -sSL https://install.python-poetry.org | python3 -
-RUN /root/.local/bin/poetry config virtualenvs.create false
-COPY pyproject.toml poetry.lock /app/
+RUN /root/.local/bin/poetry config virtualenvs.create false 
 WORKDIR /app
 
-# Install gcc to compile rumal.yaml.clib, wheel is missing.
-RUN apt-get update \
-    && apt-get install -y --no-install-recommends gcc \
-    && pip3 install --no-cache-dir ruamel.yaml.clib \
-    && apt-get purge -y --auto-remove gcc \
-    && rm -rf /var/lib/apt/lists/*
-
-RUN /root/.local/bin/poetry install --no-root --extras "all"
-
+# we install the project requirements and install the app in separate stages to optimize docker layer caching
+COPY pyproject.toml poetry.lock /app/
+RUN /root/.local/bin/poetry install --no-root --no-dev --extras "all"
 COPY src/ /app/src
-
-RUN pip3 install --no-cache-dir .
-
+RUN /root/.local/bin/poetry install --no-dev --extras "all" 
+
 COPY playbooks/ /etc/robusta/playbooks/defaults
-
 RUN python3 -m pip install --no-cache-dir /etc/robusta/playbooks/defaults
 
 # -u disables stdout buffering https://stackoverflow.com/questions/107705/disable-output-buffering