upgrade golangci-lint, run pre-commit in CI, add more pre-commit hooks

[jameslamb]

On #65, I observed linting failing in CI even though pre-commit run --all-files passed for me locally.

Looks like that was because pre-commit isn't run in CI here. Instead, this third-party action is used:

container-canary/.github/workflows/lint.yaml

Lines 15 to 16 in 8f14a3e

	- name: golangci-lint
	uses: golangci/golangci-lint-action@v4

This proposes the following:

• update to the latest version of golangci-lint in pre-commit config
• add a few more small pre-commit hooks (for trailing whitespace and newlines)
• run pre-commit in CI

[jacobtomlinson]

Looks great