chore: import upstream snapshot with attribution

ci/env/install-java.sh

@@ -0,0 +1,15 @@
+#!/usr/bin/env bash
+
+# Push caller's shell options (quietly)
+{ SHELLOPTS_STACK="${SHELLOPTS_STACK-}|$(set +o); set -$-"; } 2> /dev/null
+
+set -euxo pipefail
+
+SCRIPT_DIR=$(builtin cd "$(dirname "${BASH_SOURCE:-$0}")"; pwd)
+WORKSPACE_DIR="${SCRIPT_DIR}/../.."
+
+sudo apt-get install -y maven openjdk-8-jre openjdk-8-jdk
+"${WORKSPACE_DIR}"/java/build-jar-multiplatform.sh linux
+
+# Pop caller's shell options (quietly)
+{ set -vx; eval "${SHELLOPTS_STACK##*|}"; SHELLOPTS_STACK="${SHELLOPTS_STACK%|*}"; } 2> /dev/null