add docker build env

Dockerfile

@@ -6,11 +6,10 @@ RUN apk add --no-cache \
     bash \
     patch
 
-RUN wget https://raw.githubusercontent.com/iBotPeaches/Apktool/master/scripts/linux/apktool && \
-    wget https://bitbucket.org/iBotPeaches/apktool/downloads/apktool_3.0.2.jar
-
-RUN mv ./apktool /usr/local/bin/ && \
-    mv ./apktool_3.0.2.jar /usr/local/bin/apktool.jar && \
+RUN wget -O /usr/local/bin/apktool \
+        https://raw.githubusercontent.com/iBotPeaches/Apktool/master/scripts/linux/apktool && \
+    wget -O /usr/local/bin/apktool.jar \
+        https://bitbucket.org/iBotPeaches/apktool/downloads/apktool_3.0.2.jar && \
     chmod +x /usr/local/bin/apktool.jar && \
     chmod +x /usr/local/bin/apktool
 

README.md

@@ -60,6 +60,8 @@ You may want to add a different app version like `android:versionCode='18101' an
 
 ## Docker
 
+The docker image contains all needed tools to decompile/compile an APK.
+
 - Build the image: `docker compose build`
 - Run the container: `docker compose up -d`
 - Enter the container: `docker compose exec bejeweled-env bash`