Split /joinwatch into subcommands, minor changes to !joinwatch #598

	name: docker-test-build

	on:
	push:
	branches:
	- '**' # matches every branch
	- '!main' # excludes master

	pull_request:
	branches:
	- '**' # matches every branch

	jobs:
	cliptok-build-test:
	runs-on: ubuntu-latest
	steps:
	-
	name: Checkout
	uses: actions/checkout@v4
	-
	name: Set up Docker Buildx
	uses: docker/setup-buildx-action@v1
	-
	name: Cache Docker layers
	uses: actions/cache@v4
	with:
	path: /tmp/.buildx-cache
	key: ${{ runner.os }}-buildx-iteration3-${{ github.sha }}
	restore-keys: \|
	${{ runner.os }}-buildx-iteration3-
	-
	name: Build and push
	uses: docker/build-push-action@v5
	with:
	context: .
	file: ./Dockerfile.multiarch
	platforms: linux/amd64
	push: false
	tags: \|
	ghcr.io/erisa/cliptok:latest
	cache-from: type=local,src=/tmp/.buildx-cache
	cache-to: type=local,dest=/tmp/.buildx-cache

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