chore(java): enable separate java builds #1

	name: Build and Run Java 8 JNI Tests
	on:
	push:
	branches:
	- main
	pull_request:
	paths:
	- java/**
	- rust/**
	- .github/workflows/java_8.yml
	env:
	# This env var is used by Swatinem/rust-cache@v2 for the cache
	# key, so we set it to make sure it is always consistent.
	CARGO_TERM_COLOR: always
	# Disable full debug symbol generation to speed up CI build and keep memory down
	# "1" means line tables only, which is useful for panic tracebacks.
	RUSTFLAGS: "-C debuginfo=1"
	RUST_BACKTRACE: "1"
	# according to: https://matklad.github.io/2021/09/04/fast-rust-builds.html
	# CI builds are faster with incremental disabled.
	CARGO_INCREMENTAL: "0"
	CARGO_BUILD_JOBS: "1"
	jobs:
	linux-build:
	runs-on: ubuntu-22.04
	name: ubuntu-22.04 + Java 8
	defaults:
	run:
	working-directory: ./java
	steps:
	- name: Checkout repository
	uses: actions/checkout@v4
	- uses: Swatinem/rust-cache@v2
	with:
	workspaces: java/java-jni
	- name: Install dependencies
	run: \|
	sudo apt update
	sudo apt install -y protobuf-compiler libssl-dev
	- name: Install Java 8
	uses: actions/setup-java@v4
	with:
	distribution: temurin
	java-version: 8
	cache: "maven"
	- run: echo "JAVA_8=$JAVA_HOME" >> $GITHUB_ENV
	- name: Running tests with Java 8
	run: JAVA_HOME=$JAVA_8 mvn clean test

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