自分が消える問題を修正 #674

	name: preview

	on:
	# pull_request_target を使うにあたって https://securitylab.github.com/research/github-actions-preventing-pwn-requests/ の一読を推奨
	pull_request_target:

	permissions:
	packages: write

	env:
	IMAGE_NAME: traq-ui

	jobs:
	build-preview-image:
	name: Build Preview Image
	runs-on: ubuntu-latest
	steps:
	- name: Set PR_NUMBER env
	run: echo "PR_NUMBER=${{ github.event.number }}" >> $GITHUB_ENV

	- uses: actions/checkout@v4
	with:
	ref: ${{ github.event.pull_request.head.sha }}
	persist-credentials: false

	- name: Set up QEMU
	uses: docker/setup-qemu-action@v3
	- name: Set up Docker Buildx
	id: buildx
	uses: docker/setup-buildx-action@v3
	- name: Builder instance name
	run: echo ${{ steps.buildx.outputs.name }}
	- name: Available platforms
	run: echo ${{ steps.buildx.outputs.platforms }}

	- name: Login to GitHub Container Registry
	uses: docker/login-action@v3
	with:
	registry: ghcr.io
	username: traptitech
	password: ${{ secrets.GITHUB_TOKEN }}

	# 隔離された環境でビルドを行い、write perm付きトークンをユーザーのコードに与えないよう注意すること
	- name: Build
	uses: docker/build-push-action@v6
	with:
	context: .
	platforms: linux/amd64,linux/arm64
	push: true
	# NOTE: once https://github.com/argoproj/argo-cd/pull/13199 is released we can use short sha
	tags: ghcr.io/traptitech/${{ env.IMAGE_NAME }}:preview-${{ env.PR_NUMBER }}-${{ github.event.pull_request.head.sha }}
	cache-from: type=registry,ref=ghcr.io/traptitech/${{ env.IMAGE_NAME }}:buildcache

Provide feedback