Add support for the `vips_gamma()` function via a new func `Gamma()` … #593

	name: build

	on: [push, pull_request]

	jobs:
	build:
	name: Build
	runs-on: ubuntu-latest

	steps:
	- name: Set up Go 1.x
	uses: actions/setup-go@v2
	with:
	go-version: ^1.21

	- name: Check out code into the Go module directory
	uses: actions/checkout@v2

	- name: Install linux deps
	run: \|
	sudo apt-get update
	sudo apt-get -y install libvips-dev

	- name: Get dependencies
	run: \|
	go get -v -t -d ./...

	- name: Build
	run: go build -v ./vips

	- name: Test
	run: go test -v -coverprofile=profile.cov ./...

	- name: Coveralls
	uses: shogo82148/actions-goveralls@v1
	with:
	path-to-profile: profile.cov

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