imagelib: Implement WritableImage#save #261

	# This workflow will build a Java project with Maven
	# For more information see: https://help.github.com/actions/language-and-framework-guides/building-and-testing-java-with-maven

	name: Java CI with Maven

	on:
	push:
	branches: [ master ]

	jobs:
	build:

	runs-on: ubuntu-latest

	steps:
	- uses: actions/checkout@v2
	- name: Set up JDK 8
	uses: actions/setup-java@v2
	with:
	java-version: '8'
	distribution: 'adopt'
	- name: Cache Maven packages
	uses: actions/cache@v2
	with:
	path: ~/.m2
	key: ${{ runner.os }}-m2-${{ hashFiles('**/pom.xml') }}
	restore-keys: ${{ runner.os }}-m2
	- name: Build with Maven
	run: mvn -B package --file pom.xml
	- name: Create staging directory
	run: mkdir staging && mkdir staging/libraries
	- name: Copy JARs
	run: \|
	rm -rf /target/-without-dependencies.jar
	cp /target/.jar staging
	mv staging/*lib.jar staging/libraries
	- name: Run -welcome
	run: \|
	cd staging
	java -jar pikt.jar -welcome
	- name: Get output files
	run: ls -d "$PWD/staging/"*
	- name: Publish JAR
	uses: actions/upload-artifact@v2
	with:
	name: pikt
	path: staging

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