ci: add Github pipeline for tests and builds #5

	# Workflow for updating the upm branch automatically.

	name: upm

	on:
	push:
	branches: [ main ]
	tags: [ 'v*' ]
	workflow_dispatch:

	env:
	UNITYGIT_PATH: 'Packages/io.savolainen.unitygit'
	BRANCH_NAME: upm

	jobs:
	run:
	name: Update UPM branch
	runs-on: ubuntu-latest

	steps:
	- uses: actions/checkout@v3
	with:
	fetch-depth: 0
	- name: Set up github-bot credentials
	run: \|
	git config --global user.name 'github-bot'
	git config --global user.email 'github-bot@users.noreply.github.com'
	- name: Copy meta files to package folder
	run: cp README.md README.md.meta "$UNITYGIT_PATH"
	- name: Create commit
	run: \|
	git add -A
	git commit -m "chore(ci): prepare upm branch"
	- name: Remove existing upm branch
	run: git branch -D upm \|\| echo skipping upm branch deletion
	- name: Split subtree
	run: git subtree split -P "$UNITYGIT_PATH" -b "$BRANCH_NAME"
	- name: Push subtree
	run: git push -u origin --force "$BRANCH_NAME"
	- name: Create UPM tag
	if: startsWith(github.ref_name, 'v')
	env:
	TAG_NAME: ${{ format('upm/{0}', github.ref_name) }}
	run: \|
	git tag "$TAG_NAME" --annotate --message 'Release $TAG_NAME for upm' "$BRANCH_NAME"
	git push origin "$TAG_NAME"

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