add update-file.yml #3

	name: Start new release cycle
	on:
	workflow_dispatch: {}
	create:
	branches:
	- 'release-v*'
	permissions:
	contents: write
	pull-requests: write
	jobs:
	update-file:
	if: ${{ startsWith(github.ref, 'refs/heads/release-v')}}
	runs-on: ubuntu-latest
	steps:
	- name: "Check out main branch"
	uses: "actions/checkout@v4"
	with:
	ref: main
	- name: "Determine new release cycle"
	id: next-release-cycle
	uses: ".github/actions/next-release-cycle"
	with:
	branch-name: ${{ github.ref }}
	- name: "Update version file"
	run: \|
	echo -n "${{ steps.next-release-cycle.outputs.next-cycle }}" > tools/gen-versioned-files/agent-version.txt
	- name: "Commit and push"
	run: \|
	git config --local user.name "${GITHUB_ACTOR}"
	git config --local user.email "${GITHUB_ACTOR}@users.noreply.github.com"

	BRANCH=update-date-$(date +%s)
	git checkout -b $BRANCH

	git add tools/gen-versioned-files/agent-version.txt

	git commit -F - <<EOF
	Start release cycle ${{ steps.next-release-cycle.outputs.next-cycle }}.

	Triggered by branch ${GITHUB_REF} being created.
	EOF

	git push origin HEAD

	gh pr create -B main --fill --reviewer "${GITHUB_ACTOR}"
	env:
	GH_TOKEN: ${{ github.token }}

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