build: update Dockerfile

includes:

* use major version of Python
* remove openjdk image as base

Signed-off-by: Dwi Siswanto <git@dw1.io>

Dockerfile

@@ -1,15 +1,14 @@
-FROM python:3.8-slim-buster as build
+FROM python:3-slim
 
 LABEL description="Scanning APK file for URIs, endpoints & secrets."
 LABEL repository="https://github.com/dwisiswant0/apkleaks"
 LABEL maintainer="dwisiswant0"
 
 WORKDIR /app
-COPY requirements.txt requirements.txt
-RUN pip3 install -r requirements.txt
-COPY . .
 
-FROM openjdk:slim-buster
+COPY requirements.txt .
+RUN python -m ensurepip
+RUN pip install -r requirements.txt
+COPY . .
 
-COPY --from=build / /
-ENTRYPOINT ["/app/apkleaks.py"]
+ENTRYPOINT ["python", "/app/apkleaks.py"]