Fix one more lifetime bug in `ensure_started` for cases when the sender is dropped without connecting it #54

	# Copyright (c) 2023 ETH Zurich
	#
	# SPDX-License-Identifier: BSL-1.0
	# Distributed under the Boost Software License, Version 1.0. (See accompanying
	# file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)

	name: Linux CI (valgrind)

	on:
	merge_group:
	pull_request:
	push:
	branches:
	# Development and release branches
	- main
	- release**
	# Bors branches
	- trying
	- staging

	jobs:
	build:
	name: github/linux/valgrind
	runs-on: ubuntu-latest
	container: pikaorg/pika-ci-base:20

	steps:
	- uses: actions/checkout@v4
	- name: Update apt repositories for ccache
	run: apt update
	- name: Setup ccache
	uses: hendrikmuhs/ccache-action@v1.2
	with:
	key: ccache-linux-valgrind
	- name: Configure
	shell: bash
	# -gdwarf-4 because of https://github.com/llvm/llvm-project/issues/56550
	run: \|
	cmake \
	. \
	-Bbuild \
	-GNinja \
	-DCMAKE_CXX_COMPILER_LAUNCHER=ccache \
	-DCMAKE_BUILD_TYPE=Debug \
	-DCMAKE_CXX_FLAGS="-gdwarf-4" \
	-DPIKA_WITH_UNITY_BUILD=ON \
	-DPIKA_WITH_MALLOC=system \
	-DPIKA_WITH_EXAMPLES=ON \
	-DPIKA_WITH_TESTS=ON \
	-DPIKA_WITH_TESTS_EXAMPLES=ON \
	-DPIKA_WITH_TESTS_EXTERNAL_BUILD=OFF \
	-DPIKA_WITH_TESTS_HEADERS=OFF \
	-DPIKA_WITH_TESTS_MAX_THREADS=2 \
	-DPIKA_WITH_TESTS_VALGRIND=ON \
	-DPIKA_WITH_STACKOVERFLOW_DETECTION=Off \
	-DPIKA_WITH_CHECK_MODULE_DEPENDENCIES=On
	- name: Build
	shell: bash
	run: \|
	cmake --build build --target tests.unit.modules.execution
	cmake --build build --target std_thread_scheduler_test
	- name: Test
	shell: bash
	run: \|
	cd build
	ctest \
	-L VALGRIND \
	--timeout 300 \
	--output-on-failure

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