Use jessie-backports container as base image

Dockerfile

-FROM debian:stretch
+FROM debian:jessie-backports
 
 ENV LANG=C.UTF-8
 ENV DEBIAN_FRONTEND=noninteractive

install-dependencies-verification.sh

@@ -9,7 +9,7 @@ apt-get install -y --no-install-recommends \
 	libmagic1
 
 # Install latest diffoscope (version in Debian stable is outdated)
-pip3 install diffoscope
+pip3 install diffoscope==83
 
 # Install latest apktool for verification debugging
 wget --no-verbose https://bitbucket.org/iBotPeaches/apktool/downloads/apktool_2.3.3.jar -O /opt/apktool.jar
@@ -18,4 +18,4 @@ cat >/usr/local/bin/apktool <<EOF
 java -jar /opt/apktool.jar \$@
 EOF
 chmod +x /usr/local/bin/apktool
-mkdir -p /root/.local/share/apktool/framework
\ No newline at end of file
+mkdir -p /root/.local/share/apktool/framework

install-dependencies.sh

@@ -4,6 +4,8 @@ set -x
 
 apt-get install -y --no-install-recommends \
 	git \
-	default-jdk-headless \
 	unzip \
 	wget
+
+apt-get install -y --no-install-recommends -t jessie-backports \
+	openjdk-8-jdk-headless