Merge pull request #423 from piraveena/5-7-km-ubuntu

Upgrade to ubuntu20.04 in IS-KM-5.7

.gitignore

@@ -28,3 +28,4 @@ rat.txt
 
 # exception to the rule
 !**/files/.gitkeep
+.DS_Store

dockerfiles/ubuntu/is-as-km/Dockerfile

@@ -17,10 +17,44 @@
 # ------------------------------------------------------------------------
 
 # set base Docker image to AdoptOpenJDK Ubuntu Docker image
-FROM adoptopenjdk:8u292-b10-jdk-hotspot-focal
+# set base Docker image to JDK Ubuntu 20.04 Docker image
+FROM ubuntu:20.04
 LABEL maintainer="WSO2 Docker Maintainers <dev@wso2.org>" \
       com.wso2.docker.source="https://github.com/wso2/docker-apim/releases/tag/v2.6.0.16"
 
+#Install Open JDK
+ENV LANG='en_US.UTF-8' LANGUAGE='en_US:en' LC_ALL='en_US.UTF-8'
+
+RUN apt-get update \
+  && apt-get install -y --no-install-recommends tzdata curl ca-certificates fontconfig locales \
+  && echo "en_US.UTF-8 UTF-8" >> /etc/locale.gen \
+  && locale-gen en_US.UTF-8 \
+  && rm -rf /var/lib/apt/lists/*
+
+ENV JAVA_VERSION jdk8u292-b10
+
+RUN set -eux; \
+    ARCH="$(dpkg --print-architecture)"; \
+    case "${ARCH}" in \
+       amd64|x86_64) \
+         ESUM='699981083983b60a7eeb511ad640fae3ae4b879de5a3980fe837e8ade9c34a08'; \
+         BINARY_URL='https://github.com/adoptium/temurin8-binaries/releases/download/jdk8u312-b07/OpenJDK8U-jdk_x64_linux_hotspot_8u312b07.tar.gz'; \
+         ;; \
+       *) \
+         echo "Unsupported arch: ${ARCH}"; \
+         exit 1; \
+         ;; \
+    esac; \
+    curl -LfsSo /tmp/openjdk.tar.gz ${BINARY_URL}; \
+    echo "${ESUM} */tmp/openjdk.tar.gz" | sha256sum -c -; \
+    mkdir -p /opt/java/openjdk; \
+    cd /opt/java/openjdk; \
+    tar -xf /tmp/openjdk.tar.gz --strip-components=1; \
+    rm -rf /tmp/openjdk.tar.gz;
+
+ENV JAVA_HOME=/opt/java/openjdk \
+    PATH="/opt/java/openjdk/bin:$PATH"
+
 # set Docker image build arguments
 # build arguments for user/group configurations
 ARG USER=wso2carbon