Replace Ubuntu Focal openjdk image for Adoptjdk Focal

For some not yet identified, defauly Ubuntu openjdk 11 fail to build
current instance of Ort upstream code.
AdoptOpenJDk fix the issue as a better solution.

Signed-off-by: Helio Chissini de Castro <helio@kde.org>

Dockerfile

@@ -22,7 +22,7 @@
 
 #------------------------------------------------------------------------
 # build base for main
-FROM ubuntu:focal AS base
+FROM adoptopenjdk/openjdk11:ubuntu-slim AS base
 
 # Set shell for bash and default pipefail
 SHELL ["/bin/bash", "-o", "pipefail", "-c"]
@@ -77,7 +77,6 @@ RUN apt-get update \
         libxrender1 \
         libxtst6 \
         netbase \
-        openjdk-11-jre \
         openssh-client \
         sbt="$SBT_VERSION" \
         subversion \
@@ -114,7 +113,6 @@ RUN apt-get update \
         libssl-dev \
         make \
         netbase \
-        openjdk-11-jdk \
         openssl \
         tk-dev \
         tzdata \