Generate test TLS certificates on demand

This avoids having pem files that could expire and cause tests to
randomly start failing.

This makes tests slower, but computers are faster in 2025. If things are
really bad, we could refactor to use TestMain and make one certificate
rather than generating it on demand for tests, but I suspect this won't
be necessary.

Closes #1112.

github/workflows: bump to Go 1.22 and 1.23

build(deps): bump golangci/golangci-lint-action from 6.0.1 to 6.1.0 (#…

…1078)

Bumps [golangci/golangci-lint-action](https://github.com/golangci/golangci-lint-action) from 6.0.1 to 6.1.0.
- [Release notes](https://github.com/golangci/golangci-lint-action/releases)
- [Commits](golangci/golangci-lint-action@v6.0.1...v6.1.0)

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build(deps): bump github.com/docker/docker (#1071)

Bumps [github.com/docker/docker](https://github.com/docker/docker) from 27.0.0+incompatible to 27.0.3+incompatible.
- [Release notes](https://github.com/docker/docker/releases)
- [Commits](https://github.com/docker/docker/commits/v27.0.3)

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Add support for Healthcheck.StartInterval (v1.44 API) (#1042)

testing: fix test

build(deps): bump github.com/containerd/containerd from 1.6.18 to 1.6…

….26 (#1026)

Bumps [github.com/containerd/containerd](https://github.com/containerd/containerd) from 1.6.18 to 1.6.26.
- [Release notes](https://github.com/containerd/containerd/releases)
- [Changelog](https://github.com/containerd/containerd/blob/main/RELEASES.md)
- [Commits](containerd/containerd@v1.6.18...v1.6.26)

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feat: add platform parameter to container create (#1017)

Signed-off-by: Thomas Cooper <57812123+coopernetes@users.noreply.github.com>

Fix wrong error propagation in context (#995)

build(deps): bump github.com/opencontainers/runc from 1.1.2 to 1.1.5 (#…

…973)

Bumps [github.com/opencontainers/runc](https://github.com/opencontainers/runc) from 1.1.2 to 1.1.5.
- [Release notes](https://github.com/opencontainers/runc/releases)
- [Changelog](https://github.com/opencontainers/runc/blob/v1.1.5/CHANGELOG.md)
- [Commits](opencontainers/runc@v1.1.2...v1.1.5)

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