build: add docker build script

.dockerignore

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+### macOS
+# General
+.DS_Store
+.AppleDouble
+.LSOverride
+
+# Thumbnails
+._*
+
+# Files that might appear in the root of a volume
+.DocumentRevisions-V100
+.fseventsd
+.Spotlight-V100
+.TemporaryItems
+.Trashes
+.VolumeIcon.icns
+.com.apple.timemachine.donotpresent
+
+# Directories potentially created on remote AFP share
+.AppleDB
+.AppleDesktop
+Network Trash Folder
+Temporary Items
+.apdisk
+
+### Linux
+*~
+
+# temporary files which can be created if a process still has a handle open of a deleted file
+.fuse_hidden*
+
+# Metadata left by Dolphin file manager, which comes with KDE Plasma
+.directory
+
+# Linux trash folder which might appear on any partition or disk
+.Trash-*
+
+# .nfs files are created when an open file is removed but is still being accessed
+.nfs*
+
+# Log files created by default by the nohup command
+nohup.out
+
+### Windows
+
+# Windows thumbnail cache files
+Thumbs.db
+Thumbs.db:encryptable
+ehthumbs.db
+ehthumbs_vista.db
+
+# Dump file
+*.stackdump
+
+# Folder config file
+[Dd]esktop.ini
+
+# Recycle Bin used on file shares
+$RECYCLE.BIN/
+
+# Windows Installer files
+*.cab
+*.msi
+*.msix
+*.msm
+*.msp
+
+# Windows shortcuts
+*.lnk
+
+### JetBrains IDE
+# Covers JetBrains IDEs: IntelliJ, GoLand, RubyMine, PhpStorm, AppCode, PyCharm, CLion, Android Studio, WebStorm and Rider
+# Reference: https://intellij-support.jetbrains.com/hc/en-us/articles/206544839
+
+# User-specific stuff
+.idea
+
+# Gradle and Maven with auto-import
+*.iml
+*.ipr
+
+# File-based project format
+*.iws
+
+# IntelliJ
+out/
+
+# JIRA plugin
+atlassian-ide-plugin.xml
+
+# Crashlytics plugin (for Android Studio and IntelliJ)
+com_crashlytics_export_strings.xml
+crashlytics.properties
+crashlytics-build.properties
+fabric.properties
+
+# Editor-based HTTP Client
+http-client.private.env.json
+
+### Server
+# Compiled class file
+*.class
+
+# Log file
+*.log
+
+# BlueJ files
+*.ctxt
+
+# Mobile Tools for Java (J2ME)
+.mtj.tmp/
+
+# Package Files #
+*.war
+*.nar
+*.ear
+*.zip
+*.tar.gz
+*.rar
+*.jar
+
+# virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
+hs_err_pid*
+replay_pid*
+
+# Config
+config/*.yml
+config/*.yaml
+config/*.properties
+
+# Tests
+test/
+
+### Gradle
+.gradle
+**/build/
+!**/src/**/build/
+
+!gradle/
+!gradle/wrapper
+!gradle/wrapper/gradle-wrapper.jar
+!gradle/wrapper/gradle-wrapper.properties
+gradle-app.setting
+.gradletasknamecache
+
+# Eclipse Gradle plugin generated files
+# Eclipse Core
+.project
+# JDT-specific (Eclipse Java Development Tools)
+.classpath
+
+api/

Dockerfile

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+FROM amazoncorretto:21 AS build
+
+ARG ARTEFACT_VERSION='1.0.0'
+WORKDIR /home/app
+
+COPY gradlew .
+COPY gradle gradle
+COPY build.gradle.kts .
+COPY settings.gradle.kts .
+COPY gradle/libs.versions.toml gradle/libs.versions.toml
+
+RUN chmod +x gradlew && ./gradlew dependencies --no-daemon
+
+COPY src src
+RUN ./gradlew -PartefactVersion=${ARTEFACT_VERSION} bootJar --no-daemon
+
+FROM amazoncorretto:21-alpine
+
+WORKDIR /app
+
+COPY --from=build /home/app/build/libs/helix-server-${ARTEFACT_VERSION}.jar app.jar
+
+EXPOSE 8080
+
+ENV JAVA_OPTS="-XX:+UseContainerSupport -XX:MaxRAMPercentage=75.0"
+
+ENTRYPOINT ["sh", "-c", "java $JAVA_OPTS -jar app.jar"]