Updating readme.md #351

	name: verify package can build

	on:
	push:
	branches: [ develop ]
	pull_request:
	branches: [ develop ]

	env:
	CARGO_TERM_COLOR: always
	RUST_BACKTRACE: 1
	TOOL_DIR: ./tools
	PG_VER: 14

	jobs:
	ubuntu:
	runs-on: ubuntu-22.04

	steps:
	- uses: actions/checkout@v4
	- uses: Swatinem/rust-cache@v2
	with:
	prefix-key: "v1-pgrx--package-test"

	- name: Install Postgres deps
	run: \|
	sudo apt-get update -y -qq --fix-missing
	sudo apt-get install -y postgresql-server-dev-$PG_VER

	- name: Rustup
	run: $TOOL_DIR/rustup.sh nightly

	- name: Install cargo pgrx
	run: cargo +nightly install --path cargo-pgrx --debug

	- name: cargo pgrx init
	run: cargo +nightly pgrx init "--pg$PG_VER=$(which pg_config)"

	- name: Test pgrx can be packaged as a new version
	run: \|
	./update-versions.sh 0.0.999-rc.999 && \
	cargo +nightly package \
	--workspace -Zpackage-workspace \
	--allow-dirty \
	--features "pg$PG_VER"

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