For the repo, typically the DockerFile will be stored with the repository to ensure that the proper build steps are performed. In general a builder step will build the executable and a production image will be created to store the executable and all dependencies.


Example from a go repository

FROM golang:1.19-alpine3.16 AS builder

RUN apk add --no-cache \
    build-base \
    gcc \
    git
ENV GOROOT=/usr/local/go
ENV GOPATH=/go
ENV PATH=$PATH:$GOROOT/bin:$GOPATH/bin

WORKDIR /app
RUN git clone https://github.com/USACE/seed-generator.git
WORKDIR /app/seed-generator
RUN go mod download
RUN go mod tidy
RUN go build -o seed-generator


FROM alpine:3.16 AS prod

WORKDIR /app
COPY --from=builder /app/seed-generator/seed-generator .
CODE


Example from a Java repository

FROM hmstesting/ubuntu:ubuntu20.04_openjdk11 as builder
ENV TZ=America/New_York
#need to get the jdk.
RUN apt update
RUN apt -y install wget

RUN wget https://www.hec.usace.army.mil/nexus/repository/maven-public/mil/army/usace/hec/hec-hms/4.11-beta.16-linux64/hec-hms-4.11-beta.16-linux64.tar.gz -P /
RUN tar -xvzf /hec-hms-4.11-beta.16-linux64.tar.gz -C /
#apt-get -y install git
RUN apt -y install git
RUN apt -y install libgfortran5
RUN apt -y install unzip

RUN wget https://services.gradle.org/distributions/gradle-7.3.1-bin.zip -P /tmp
RUN unzip -d /opt/gradle /tmp/gradle-7.3.1-bin.zip
RUN ln -s /opt/gradle/gradle-7.3.1 /opt/gradle/latest
ENV GRADLE_HOME=/opt/gradle/latest
ENV PATH=${GRADLE_HOME}/bin:$PATH
ENV USERNAME=username
ENV TOKEN=token

RUN mkdir -p /app
WORKDIR /app
#clone repo
RUN git clone https://github.com/USACE/hms-runner.git
WORKDIR /app/hms-runner
#build gradle
RUN gradle build --no-daemon

FROM ubuntu:20.04 as prod
RUN apt update
RUN apt -y install libxrender1 libxtst6 libxi6 libfreetype6 libgfortran5 libfontconfig1
#get built jar and put in prod container.
RUN mkdir -p  /hms

COPY --from=builder /app/hms-runner/build/libs /hms
RUN mkdir -p  /HEC-HMS-4.11-beta.16
COPY --from=builder /HEC-HMS-4.11-beta.16 /HEC-HMS-4.11-beta.16
COPY --from=builder /root/.gradle/caches/modules-2/files-2.1/mil.army.usace.hec/wat-java-sdk/0.0.10/85002ec5390529db62a4cd6ed5a4cd0620b03634/wat-java-sdk-0.0.10.jar /HEC-HMS-4.11-beta.16/lib
ENV HMS_HOME=/HEC-HMS-4.11-beta.16
ENV JAVA_EXE=$HMS_HOME/jre/bin/java
ENV JAVA_HOME=$HMS_HOME/jre
ENV PROG=hms.hms
ENV PATH=$HMS_HOME/bin/taudem:$HMS_HOME/bin/mpi:$HMS_HOME/bin:$HMS_HOME/jre/bin/:$HMS_HOME/jre/lib/:$PATH
ENV GDAL_DATA=$HMS_HOME/bin/gdal/gdal-data
ENV PROJ_LIB=$HMS_HOME/bin/gdal/proj
ENV CLASSPATH=$HMS_HOME/*:$HMS_HOME/lib/*:$HMS_HOME/lib/hec/*:$HMS_HOME/jre/lib/*
ENV JAVA_OPTS="-Djava.library.path=$HMS_HOME/bin/gdal:$HMS_HOME/bin"

WORKDIR hms
ENTRYPOINT ["java", "-Djava.library.path=/HEC-HMS-4.11-beta.16/bin/gdal:/HEC-HMS-4.11-beta.16/bin", "-jar", "hms-runner-0.0.1.jar"]
 #cmd will append
CODE