Make Serde into an optional dependency #202

	name: Build

	on:
	push:
	branches: [ main ]
	pull_request:
	branches: [ main ]
	release:
	types: [ published ]
	workflow_dispatch:

	jobs:
	test:
	runs-on: ubuntu-latest
	env:
	RUST_BACKTRACE: 1
	steps:
	- uses: actions/checkout@v4
	- name: rust-info
	run: rustc --version && cargo --version
	- uses: Swatinem/rust-cache@v2
	if: github.event_name != 'release' && github.event_name != 'workflow_dispatch'
	- name: install varnish-dev
	run: \|
	curl -s https://packagecloud.io/install/repositories/varnishcache/varnish75/script.deb.sh \| sudo bash
	sudo apt-get install -y varnish-dev
	- name: test-fmt
	run: cargo fmt --all -- --check
	- name: build
	run: cargo build --workspace --all-targets
	- name: test
	run: cargo test --workspace --all-targets
	- name: build-all
	run: cargo build --workspace --all-targets --all-features
	- name: test-all
	run: cargo test --workspace --all-targets --all-features
	- name: test-doc
	run: \|
	cargo test --doc
	cargo doc --no-deps
	- name: clippy
	run: cargo clippy --workspace --all-targets

	# Ensure that the docs can be built at docs.rs without varnish dependencies
	test-docs-rs:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4
	- name: rust-info
	run: rustc --version && cargo --version
	- uses: Swatinem/rust-cache@v2
	if: github.event_name != 'release' && github.event_name != 'workflow_dispatch'
	- name: Ensure docs can be built at docs.rs without varnish dependencies
	run: cargo doc --no-deps

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