Fix: some docker specifics

Dockerfile

 FROM python:3.7-slim-buster
 
+RUN apt update
+RUN apt install gcc python3-dev -y
+
 RUN mkdir /app
 ADD . /app
 
+ENV NO_VENV=1
 WORKDIR /app
 RUN ./bin/install.sh

bin/_venv

@@ -6,10 +6,14 @@ if ! hash python3 &> /dev/null; then
 fi
 echo "OK"
 
-if [ ! -f .venv/bin/activate ]; then
-  echo "Creating new venv in: ./.venv"
-  python3 -m venv ./.venv
-fi
+if [ "$NO_VENV" != "1" ]; then
+  if [ ! -f .venv/bin/activate ]; then
+    echo "Creating new venv in: ./.venv"
+    python3 -m venv ./.venv
+  fi
 
-echo "Loading virtualenv: ./.venv"
-source ./.venv/bin/activate
+  echo "Loading virtualenv: ./.venv"
+  source ./.venv/bin/activate
+else
+  echo "Skipping venv setup"
+fi

bin/docker-entry.sh

 #!/usr/bin/env bash
 
-source ./_venv
+source ./bin/_venv
 
 if [ "$1" != "" ] && [ -f $1 ]; then
   echo "Using provided .env file: $1"

bin/install.sh

@@ -8,6 +8,6 @@ pip3 install -r requirements.txt --no-cache-dir
 if [ $? -eq 0 ]; then
   echo -e "\n----------------------------"
   echo -e "Almost done! \\o/\n"
-  echo "Run 'PYTHON_ENV=[development|prodcution] ./docker-entry.sh .env.example' to start the server!"
+  echo "Run 'PYTHON_ENV=[development|prodcution] ./bin/docker-entry.sh .env.example' to start the server!"
   echo -e "\nIf you want to make changes to the python packages, e.g. 'pip3 install ...', activate the venv, first: '. .venv/bin/activate'"
 fi