dev: updated Dockerfile structure

Dockerfile

@@ -1,10 +1,16 @@
-# Install alpine, python3 and pip
-FROM alpine:latest
+FROM python:3.8-slim
 LABEL maintainer="oppsec <https://github.com/oppsec>"
-RUN apk add --no-cache python3 py3-pip
 
-# Create directories
+ENV LANG=C.UTF-8
+ENV LC_ALL=C.UTF-8
+ENV PIP_NO_CACHE_DIR=off
+
 WORKDIR /tomcter
+
+RUN apt-get update && \
+    apt-get install -y openssl python3 git apt-utils
+
+# Create directories
 COPY . .
 
 # Install libraries and run