feat(android): add CI image for building Keyman for Android

resources/docker-images/android/Dockerfile

@@ -0,0 +1,68 @@
+# Copyright (c) 2024 SIL International. All rights reserved.
+
+ARG BASE_VERSION=latest
+FROM --platform=amd64 keymanapp/keyman-base-ci:${BASE_VERSION}
+LABEL org.opencontainers.image.authors="SIL International."
+LABEL org.opencontainers.image.url="https://github.com/keymanapp/keyman.git"
+LABEL org.opencontainers.image.title="Keyman Android Build Image"
+
+# Keyman for Android
+SHELL ["/bin/bash", "-c"]
+# Starting with Ubuntu 24.04 sdkmanager is no longer available, instead
+# a version dependent package allows to install the cmdline tools
+ARG JAVA_VERSION=11
+RUN <<EOF
+  OS_VER=$(lsb_release -r -s 2>/dev/null)
+  echo "OS_VER=${OS_VER}"
+  if (( ${OS_VER%%.*} > 22 )); then
+    PKG_SDKMANAGER=google-android-cmdline-tools-13.0-installer
+    DIR_SDK=/usr/lib/android-sdk
+  else
+    PKG_SDKMANAGER=sdkmanager
+    DIR_SDK=/opt/android-sdk
+  fi
+  apt-get -q -y install gradle maven pandoc $PKG_SDKMANAGER jq openjdk-${JAVA_VERSION}-jdk
+  sdkmanager platform-tools
+  yes | sdkmanager --licenses
+  chown -R build:build $DIR_SDK
+  echo "#!/bin/bash" > /usr/bin/bashwrapper
+  echo "export ANDROID_HOME=$DIR_SDK" >> /usr/bin/bashwrapper
+  echo "export JAVA_HOME_${JAVA_VERSION}=/usr/lib/jvm/java-${JAVA_VERSION}-openjdk-amd64" >> /usr/bin/bashwrapper
+EOF
+
+# Finish bashwrapper script and adjust permissions
+RUN <<EOF cat >> /usr/bin/bashwrapper
+
+if [[ "\$@" =~ test ]] && [ -f /usr/bin/run-tests.sh ]; then
+  /usr/bin/run-tests.sh "\${@:-bash}"
+else
+  "\${@:-bash}"
+fi
+EOF
+
+RUN chmod +x /usr/bin/bashwrapper && \
+  chown -R build:build $HOME
+
+# now, switch to build user
+USER build
+
+VOLUME /home/build/build
+WORKDIR /home/build/build
+
+# Pre-install gradle. This will put files in ~/.gradle which will speed up builds.
+RUN mkdir -p $HOME/tmp/gradle/wrapper && \
+  # KMEA uses gradle-7.5.1-bin
+  curl --location --output $HOME/tmp/gradle/wrapper/gradle-wrapper.jar https://raw.githubusercontent.com/keymanapp/keyman/master/android/KMEA/gradle/wrapper/gradle-wrapper.jar && \
+  curl --location --output $HOME/tmp/gradle/wrapper/gradle-wrapper.properties https://raw.githubusercontent.com/keymanapp/keyman/master/android/KMEA/gradle/wrapper/gradle-wrapper.properties && \
+  curl --location --output $HOME/tmp/gradlew https://raw.githubusercontent.com/keymanapp/keyman/master/android/KMEA/gradlew && \
+  chmod +x $HOME/tmp/gradlew && \
+  $HOME/tmp/gradlew --quiet && \
+  # Some projects use gradle-7.5.1-all, so we pre-install that as well
+  curl --location --output $HOME/tmp/gradle/wrapper/gradle-wrapper.jar https://raw.githubusercontent.com/keymanapp/keyman/master/android/Samples/KMSample1/gradle/wrapper/gradle-wrapper.jar && \
+  curl --location --output $HOME/tmp/gradle/wrapper/gradle-wrapper.properties https://raw.githubusercontent.com/keymanapp/keyman/master/android/Samples/KMSample1/gradle/wrapper/gradle-wrapper.properties && \
+  curl --location --output $HOME/tmp/gradlew https://raw.githubusercontent.com/keymanapp/keyman/master/android/Samples/KMSample1/gradlew && \
+  chmod +x $HOME/tmp/gradlew && \
+  $HOME/tmp/gradlew --quiet && \
+  rm -rf $HOME/tmp
+
+ENTRYPOINT [ "/usr/bin/bashwrapper" ]