feat: add devcontainer for VS Code and GitHub Codespaces #1

	name: devcontainer-version-check

	on:
	pull_request:
	branches:
	- main
	paths:
	- 'go.mod'
	- '.devcontainer/Dockerfile'

	permissions:
	contents: read

	jobs:
	check-go-version-alignment:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2

	- name: Verify Dockerfile Go version satisfies go.mod
	run: \|
	# Extract the major.minor Go version required by go.mod
	GOMOD_VERSION=$(grep '^go ' go.mod \| awk '{print $2}')
	GOMOD_MAJOR_MINOR=$(echo "$GOMOD_VERSION" \| grep -oE '^[0-9]+\.[0-9]+')

	# Extract the Go version from the Dockerfile base image tag
	DOCKERFILE_TAG=$(grep -oP 'devcontainers/go:\K[0-9]+\.[0-9]+' .devcontainer/Dockerfile)

	echo "go.mod requires: go ${GOMOD_VERSION} (major.minor: ${GOMOD_MAJOR_MINOR})"
	echo "Dockerfile base image: go:${DOCKERFILE_TAG}"

	if [[ -z "$GOMOD_MAJOR_MINOR" \|\| -z "$DOCKERFILE_TAG" ]]; then
	echo "ERROR: Could not parse versions"
	exit 1
	fi

	if [[ "$GOMOD_MAJOR_MINOR" != "$DOCKERFILE_TAG" ]]; then
	echo ""
	echo "ERROR: Version mismatch!"
	echo "The devcontainer base image (go:${DOCKERFILE_TAG}) does not match"
	echo "the Go version required by go.mod (${GOMOD_MAJOR_MINOR})."
	echo ""
	echo "Update .devcontainer/Dockerfile:"
	echo " FROM mcr.microsoft.com/devcontainers/go:${GOMOD_MAJOR_MINOR}-bookworm"
	echo ""
	echo "You may also need to update the pinned Go tool versions in the Dockerfile"
	echo "(gopls, delve, staticcheck, gotext) to versions compatible with Go ${GOMOD_MAJOR_MINOR}."
	exit 1
	fi

	echo "OK: Versions are aligned."

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