Reduced the size of processor image

Instead of using python3 full image, switched to python:3.7-slim-buster.

Author: aimbot31

CloudKitty/processor/Dockerfile

@@ -1,5 +1,19 @@
-FROM python:3.7-buster
+FROM python:3.7-slim-buster
 
-RUN pip install cloudkitty PyMySQL
+RUN apt-get update \
+    && apt-get install --no-install-recommends -y \
+        gcc \
+        python3-dev \
+    && pip install cloudkitty PyMySQL \
+    && mkdir \
+        /etc/cloudkitty \
+        /etc/cloudkitty-config \
+    && apt-get purge -y \
+        gcc \
+        python3-dev \
+    && apt-get clean -y \
+    && rm -rf /var/cache/apt \
+    && rm -rf /var/lib/apt/lists/* \
+    && mkdir /etc/cloudkitty
 
 CMD [ "cloudkitty-processor" ]