fix: make `IMAGE_TAG` available in buildArgs when used in docker `FROM` #2853

	name: unit tests (linux)

	# Triggers the workflow on push or pull request events
	on: [push, pull_request]

	permissions: read-all

	concurrency:
	group: build-${{ github.event.pull_request.number \|\| github.ref }}-${{github.workflow}}
	cancel-in-progress: ${{ github.ref != 'refs/heads/main' }}

	jobs:
	build:
	name: unit tests (linux)
	runs-on: ubuntu-latest
	steps:
	- name: Set up Go
	uses: actions/setup-go@v5
	with:
	go-version: 1.23.*
	id: go

	- name: Check out code into the Go module directory
	uses: actions/checkout@v4
	with:
	fetch-depth: 0

	# Skip tests for `docs`-only changes (only works for PR-based dev workflows like Skaffold's).
	# NOTE: grep output is stored in env var with `\|\| true` as the run command cannot fail or action will fail
	- name: Check if only docs changes were made in this PR
	run: \|
	echo ${{ github.event.before }}
	echo ${{ github.event.after }}
	NON_DOCS_FILES_CHANGED=$(git diff --name-only ${{ github.event.pull_request.base.sha }}..${{ github.sha }}\| grep -v '^docs/' \|\| true)
	echo "NON_DOCS_FILES_CHANGED=${#NON_DOCS_FILES_CHANGED}" >> $GITHUB_ENV # get the char len of diff output (used later)

	- name: Run unit tests
	if: ${{ env.NON_DOCS_FILES_CHANGED != 0 }}
	run: \|
	make coverage

	- name: Run diagnostics tests
	if: ${{ env.NON_DOCS_FILES_CHANGED != 0 }}
	run: \|
	make -f Makefile.diag coverage

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