Use a custom OpenJDK base container image.
Change-Id: I9b24bdaf5f07974de12ae408df3b9a25e8268a48
diff --git a/src/main/docker/runtime/Dockerfile b/src/main/docker/runtime/Dockerfile
new file mode 100644
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--- /dev/null
+++ b/src/main/docker/runtime/Dockerfile
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+# SPDX-FileCopyrightText: © 2022 Matthias Andreas Benkard <code@mail.matthias.benkard.de>
+#
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+FROM registry.access.redhat.com/ubi8/ubi-minimal:latest AS ubi-minimal
+
+# Add OpenJDK (complete).
+ADD jdk-dist/latest.tar.gz /jdk
+
+# JLink a trimmed JDK.
+RUN microdnf --assumeyes --nodocs install binutils
+RUN /jdk/*/bin/jlink \
+ -J-XX:MaxRAMPercentage=75 \
+ --add-modules ALL-MODULE-PATH \
+ --compress=1 \
+ --no-man-pages \
+ --strip-debug \
+ --output /java
+RUN /java/bin/java -Xshare:dump
+
+# Set mtimes to @0 for reproducibility.
+RUN microdnf --assumeyes --nodocs install findutils
+RUN find /java -exec touch --date=@0 '{}' ';'
+
+# Build the final image.
+FROM registry.access.redhat.com/ubi8/ubi-micro:latest
+COPY --from=ubi-minimal /lib64/libz.so.1 /lib64/
+COPY --from=ubi-minimal /java /java
+ENV JAVA_HOME=/java
+ENV PATH=/java/bin:$PATH