Add initial Dockerfile and CI workflow

.dockerignore

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+.git/
+.github/

.github/workflows/ci.yml

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+name: build
+
+on:
+  workflow_dispatch: {} # allow workflow to be run manually
+  push:
+    branches: [ main ]
+  release:
+    types: [ published ]
+
+jobs:
+
+  build:
+
+    name: Build Image
+
+    runs-on: ubuntu-latest
+
+    steps:
+
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      # - run: echo ::set-env name=IMAGE_TAG::${GITHUB_REF:10}
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v1
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
+
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v1 
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build
+        id: build
+        uses: docker/build-push-action@v2
+        with:
+          push: ${{ github.event_name	== 'release' }}
+          tags: |
+            ghcr.io/${{ github.repository_owner	}}/mapi:latest
+
+      - name: Image digest
+        run: echo ${{ steps.build.outputs.digest }}

Dockerfile

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+FROM maven:3-openjdk-11-slim
+
+ENV DEPENDENCY="org.apache.maven.plugins:maven-dependency-plugin:3.1.2"
+
+ADD . /
+
+# try to download as much dependencies as possible during build
+
+RUN mvn package -B
+RUN mvn ${DEPENDENCY}:go-offline -B
+RUN mvn ${DEPENDENCY}:get -Dartifact=${DEPENDENCY}:jar -B

README.md

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-# docker-mapi
 Maven Atlassian Plugin Installer
+================================
+
+Usage: Start the Docker container and run the `./download.sh` script as follows:
+
+```
+./download.sh <MAVEN_ARTIFACT_ID> <OUTPUT_DIRECTORY>
+```
+
+The script will download the artifact without version to the output directory. E.g.:
+
+```
+./download.sh de.aservo:confapi-crowd-plugin:0.0.8:jar ./plugins
+```
+
+This will result in:
+
+```
+$ ls ./plugins
+confapi-crowd-plugin.jar
+```

download.sh

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+#!/bin/sh
+
+ARTIFACT=$1
+OUTPUT=$2
+
+DEPENDENCY="org.apache.maven.plugins:maven-dependency-plugin:3.1.2"
+
+mvn $DEPENDENCY:get  -Dartifact=$ARTIFACT -Dtransitive=false -B
+mvn $DEPENDENCY:copy -Dartifact=$ARTIFACT -DoutputDirectory=$OUTPUT -Dmdep.stripVersion=true -B

pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>de.aservo</groupId>
+    <artifactId>stub</artifactId>
+    <version>0.0.0</version>
+
+</project>