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Tighten Dockerfile: pinning, certs, GPG hygiene #3

	name: Build the docker container
	on:
	push:
	branches:
	- main
	pull_request:
	jobs:
	build:
	name: Build
	runs-on: ubuntu-24.04
	if: ${{ !contains(github.event.head_commit.message, 'docs:') }}
	steps:
	- name: Checkout code
	uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4

	- name: Build an image from Dockerfile
	run: \|
	docker buildx install
	docker buildx build --load --platform linux/amd64 -t docker.io/sitespeedio/node:${{ github.sha }} .