Use multi-stage building to eliminate multiple layers of the Docker image which are not needed (#150)

Dockerfile

@@ -1,5 +1,4 @@
-ARG ARCH
-FROM ${ARCH}python:3.11-slim
+FROM python:3.11-slim as base
 
 # set version label
 ARG BUILD_DATE
@@ -14,20 +13,56 @@ ENV APPRISE_CONFIG_DIR /config
 ENV APPRISE_ATTACH_DIR /attach
 ENV APPRISE_PLUGIN_PATHS /plugin
 
+FROM base as builder
+
+WORKDIR /build/
+
 # Install nginx, supervisord, and cryptography dependencies
-RUN apt-get update -qq && \
-    apt-get install -y -qq nginx supervisor git curl \
-    build-essential libffi-dev libssl-dev pkg-config python3-dev
-
+RUN set -eux && \
+    echo "Installing build dependencies" && \
+        apt-get update -qq && \
+        apt-get install -y -qq \
+            curl \
+            build-essential \
+            libffi-dev \
+            libssl-dev \
+            pkg-config && \
+    echo "Updating pip and getting requirements to build" && \
         # Cryptography documents that the latest version of pip3 must always be used
-RUN pip3 install --upgrade pip
-
+        python3 -m pip install --upgrade \
+            pip \
+            wheel && \
+    echo "Installing latest rustc" && \
         # Pull in bleeding edge of rust to keep up with cryptography build requirements
-RUN curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y
+        curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --profile minimal && \
+        . "$HOME/.cargo/env" && \
+    echo "Buildingcryptography" && \
+        python3 -m pip wheel \
+            --no-binary cryptography \
+            cryptography
+
+FROM base as runtime
 
 # Install requirements and gunicorn
 COPY ./requirements.txt /etc/requirements.txt
-RUN . "$HOME/.cargo/env" && pip3 install --no-cache-dir -q -r /etc/requirements.txt gunicorn --no-binary cryptography
+COPY --from=builder /build/*.whl .
+RUN set -eux && \
+    echo "Installing cryptography" && \
+        pip3 install *.whl && \
+    echo "Installing python requirements" && \
+        pip3 install --no-cache-dir -q -r /etc/requirements.txt gunicorn supervisor && \
+    echo "Installing nginx" && \
+        apt-get update -qq && \
+        apt-get install -y -qq \
+            nginx && \
+    echo "Cleaning up" && \
+        apt-get --yes autoremove --purge && \
+        apt-get clean --yes && \
+        rm --recursive --force --verbose /var/lib/apt/lists/* && \
+        rm --recursive --force --verbose /tmp/* && \
+        rm --recursive --force --verbose /var/tmp/* && \
+        rm --recursive --force --verbose /var/cache/apt/archives/* && \
+        truncate --size 0 /var/log/*log
 
 # Copy our static content in place
 COPY apprise_api/static /usr/share/nginx/html/s/
@@ -38,12 +73,6 @@ WORKDIR /opt/apprise
 # Copy over Apprise API
 COPY apprise_api/ webapp
 
-# Cleanup
- RUN . "$HOME/.cargo/env" && rustup self uninstall -y && \
-     apt-get remove -y -qq curl build-essential libffi-dev libssl-dev python3-dev pkg-config && \
-     apt-get clean autoclean && \
-     apt-get autoremove --yes && \
-         rm -rf /var/lib/{apt,dpkg,cache,log}/
 #
 # # Configuration Permissions (to run nginx as a non-root user)
 RUN umask 0002 && \
@@ -56,4 +85,4 @@ VOLUME /config
 VOLUME /attach
 VOLUME /plugin
 EXPOSE 8000
-CMD ["/usr/bin/supervisord", "-c", "/opt/apprise/webapp/etc/supervisord.conf"]
+CMD ["/usr/local/bin/supervisord", "-c", "/opt/apprise/webapp/etc/supervisord.conf"]